A population-based study on toxicological findings in Swedish homicide victims and offenders from 2007 to 2009

A Descriptive Study of the Characteristics of Homicide-Suicide in Forensic Autopsy Cases

Homicide followed by suicide (HS) is a tragic event with varied characteristics across countries and regions. Compared to Western countries, there are limited studies on HS in Asian countries. Therefore, this study aimed to clarify the characteristics of recent HS cases by examining forensic autopsy records from 2008 to 2020 collected from the Department of Legal Medicine, Chiba University, in Japan. A total of 77 HS cases were identified, involving 77 perpetrators (52 completed suicides, 25 attempted suicides), with 28 perpetrator and 89 victim autopsies. Our findings showed that older adults accounted for nearly half of the victims; victims were mostly females, whereas most perpetrators were male. The most common HS relationship was that between a parent and a child. Autopsy findings showed that the most common cause of death was strangulation, and illegal drugs were detected only in a few cases; however, psychotropic drugs were detected in child victims. No obvious evidence of past child physical abuse by caregivers was found. In contrast, intimate partner violence (IPV) was present, with a history of IPV found in half of HS cases involving adult intimate partner relationships. Notably, gender differences in age and relationship to the victim were identified. Likewise, some perpetrators may have expressed their plans and intentions for HS before the event, which may represent an important sign for HS prevention. However, to accurately reveal the course of HS, nationwide integrated statistics, forensic autopsies, including toxicological analyses of the deceased; and forensic psychiatric perspectives, including psychological autopsy, are required.

Alcohol-related mortality in 15–24-year-olds in Denmark (2010–2019): a nationwide exploratory study of circumstances and socioeconomic predictors

Background

Adolescents and young adults aged 15-24 years are disproportionately affected by unnatural deaths, including accidents, suicide and interpersonal violence for which alcohol is a leading risk factor. We aimed to explore the extent of and circumstances surrounding alcohol-related deaths in young people aged 15-24 years and whether socioeconomic background and ethnicity differ in those who died due to alcohol-related causes as compared to the background population.

Methods

All deaths of 15-24-year-olds occurring in Denmark from 2010 to 2019 were investigated. We manually reviewed death certificates containing information on circumstances, results from autopsies and blood tests, and statements from witnesses. Relevant information published in the media (most often newspaper articles) was included. Our main outcome measures were alcohol-related death and manner of death (accidents (transport accidents, drownings, falls, poisonings), suicide and violence). Further, we designed a population-based case-control study including 10 age- and sex-matched controls per case to test whether there was a socioeconomic gradient in alcohol-related deaths. We used parents' educational level and employment status to define socioeconomic position. Immigration status was used to assess ethnicity.

Findings

Over the 10-year period, 1783 deaths occurred among 15-24-year-olds. Of those, 1067 (60%) were due to unnatural causes, corresponding to a mortality rate of 14.8 (95% confidence interval: 13.9-15.7) per 100,000. Twelve percent of unnatural deaths (n = 125) were alcohol related, corresponding to a rate of 1.7 (1.4-2.0) per 100,000, and were higher in males (2.9 [2.3-3.4]) than in females (0.6 [0.3-0.8]); thus, males accounted for 105 (84%) of alcohol-related deaths. The majority of alcohol-related deaths occurred on Fridays, Saturdays and Sundays (n = 77, 62%). Accidents accounted for 82% (n = 102) of alcohol-related deaths, followed by suicide (n = 19, 15%) and interpersonal violence (n = 4, 3%). Of all fatal accidents, 102 of 636 (16%) were alcohol related. Of all deaths caused by drownings and falls, 14 of 26 (54%) and 10 of 25 (40%), respectively, were alcohol related. Alcohol-related drownings most often occurred while the deceased was alone, whereas alcohol-related falls most often occurred in relation to parties, involving falls from a window or balcony. Those who died from alcohol-related causes more often had parents with a short education or who were unemployed, as compared to the general population. For example, odds ratios were 3.9 (2.2-7.0) and 1.8 (1.2-2.9) for having parents with short and medium as compared to long educations. The odds ratio for being of Danish origin was 4.0 (1.7-9.5) compared to being first- or second-generation immigrants.

Interpretation

In 15-24-year-olds, alcohol-related deaths accounted for a substantial proportion of all unnatural deaths. There was substantial socioeconomic inequality in alcohol-related deaths, as has repeatedly been shown for chronic alcohol-related mortality in older adults.

Funding

Trygfonden.

Mental Disorders and Intimate Partner Femicide: Clinical Characteristics in Perpetrators of Intimate Partner Femicide and Male-to-Male Homicide

Intimate partner violence against women is a global and persistent public health issue. An extreme manifestation of this problem is intimate partner femicide (IPF), the killing of a woman by a male partner. While declining trends of homicide rates have been observed over decades, rates of femicide and IPF have remained stable. Yet, IPF as a phenomenon has until recently been fairly invisible in Europe, why research from the European countries on rates and characteristics of IPF has been relatively scarce. One area of research, particularly in need of further scrutiny, is to what degree perpetrators of IPF suffer from mental health conditions, and what the clinical features are. The objective of present study was to add to the existing literature by investigating prevalence and types of mental disorders in perpetrators of IPF, and to compare with male-to-male homicide (MMH) perpetrators. Our aim was also to examine life-time contact with psychiatric services, and, with missed opportunities in mind, contacts shortly preceding the homicide. With a retrospective design, this population-based study includes all solved cases of male-perpetrated homicides against intimate female partners (IPF) and other males (MMH) committed in Sweden between January 2007 and December 2009. Primary and secondary psychiatric diagnoses based on ICD, version 8, 9 or 10 from psychiatric inpatient as well as outpatient care have been retrieved. In order to identify mental disorders in perpetrators during commission of the homicidal offense, we also retrieved diagnoses from forensic psychiatric evaluations. Our results demonstrate that approximately one-third of the perpetrators, irrespective of homicide type, had been diagnosed with a mental disorder (excluding substance related disorders) at some point in life. Diagnosis of substance related disorders from psychiatric care was significantly more common in MMH perpetrators (37%) compared to IPF perpetrators (15%). Similarly low rates of major mental disorder were found in both groups (11%) when aggregating life-time diagnoses and diagnoses during commission of the crime. However, homicide-suicide in connection to the offense was relatively common in IPF perpetrators (20%). Thus, our study supports the notion that previous suicide attempts and suicide ideation are important indicators for predicting and possibly preventing IPF.

Circumstances and toxicology of violence-related deaths among young people who have had contact with the youth justice system: a data linkage study

Background

Young people who have had contact with the youth justice system have an increased risk of dying from violence. Examining the context of violence-related deaths is essential in informing prevention strategies. We examined the circumstances and toxicology of violence-related deaths among young people who have had contact with the youth justice system in Queensland, Australia.

Methods

This data linkage study linked youth justice records from Queensland, Australia (30 June 1993-1 July 2014) on 48,670 young people to national death and coroner records (1 July 2000-1 January 2017). Circumstances and toxicology of deaths were coded from coroner’s records. We calculated the incidence of violence-related deaths that were reported to a coroner. Fisher’s exact tests were used to examine crude differences in the circumstances and toxicology of violence-related death, according to sex and Indigenous status.

Results

There were 982 deaths reported to a coroner in the cohort. Of which, 36 (4%) were from violence-related causes (incidence: 6 per 100,000 person-years, 95% confidence interval: 4-8). People who died from violence were most frequently male (n = 28/36; 78%), and almost half were Indigenous (n = 16/36; 44%). The majority of violence-related deaths involved a weapon (n = 24/36; 67%), most commonly a knife (n = 17/36; 47%). Compared to men where the violent incident was most frequently preceded by an altercation (n = 12/28; 43%), for women it was frequently preceded by a relationship breakdown or argument (n < 5; p = 0.004). Substances most commonly present in toxicology reports were cannabis (n = 16/23; 70%) and alcohol (n = 15/23; 65%).

Conclusions

Therapeutic alcohol and other drug programs, both in the community and detention, are likely important for reducing violence-related deaths among young people who have had contact with the youth justice system. The majority of violence-related deaths among women were in the context of intimate partner violence, indicating the urgent need for interventions that prevent intimate partner violence in this population. Diversion programs and increased investment in health and social services may reduce the overrepresentation of Indigenous people in the youth justice system and in violence-related deaths.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12889-021-12244-z.

Criminal mutilation in Sweden from 1991 to 2017

We identified 43 cases of mutilation homicides in a nationwide population-based study in Sweden during the period of 1991-2017. 70% of cases were classified as defensive mutilations where the main motive was disposal of the body, while 30% were classified as offensive, that is, due to an expression of strong aggression, necro-/sexual sadism, or psychiatric illness. In comparison with a previous study covering mutilation homicides in Sweden between 1961 and 1990, we noted an increase in incidence. The percentage of cases involving mutilation had increased from 0.5% of all homicides in the 1960s to 2.4% in the 2010s. The most common cause of death was sharp force, but in 28% of the cases, the cause of death could not be determined. The clearance rate in cases of mutilation homicide was 67%, and in a large majority of the cases, the offender was known to the victim. With regards to gender women made up 44% of the victims, whilst men constituted 56% of the victims and a total of 95% of the offenders. Half of the offenders had a personality disorder, however, only 13% were sentenced to forensic psychiatric care.

Association between homicide injury severity and benzodiazepine influence

There are case reports of offenders inflicting excessive injuries on their victims when under the influence of benzodiazepines. However, the potential association between benzodiazepine influence on the offender and victim injury severity in a general homicide population has not been studied. We investigated associations between offender positive testing for benzodiazepines or z-drugs (zolpidem, zopiclone and zaleplon) and victim injury severity. Data were drawn from 95 Swedish homicide cases from 2007–2009 in which offenders had known toxicology. There were no significant differences in injury severity between cases in which the offender tested positive vs. negative for benzodiazepines/z-drugs. Thus, the findings do not support the hypothesis that there is an association between benzodiazepine influence on the offender and victim injury severity in a general homicide population.

Key points

Some previous studies have linked benzodiazepines to aggression, violence and excessive homicide injuries.

The present study analysed the association between homicide injury severity and benzodiazepine status of the offender.

Offenders who tested positive for benzodiazepines did not inflict more severe injuries on their victims.

These findings do not support the hypothesis that benzodiazepine influence generally causes offenders to inflict more severe injuries on homicide victims.

Clinical Characteristics and Pharmacological Treatment of Individuals With and Without Intellectual Disability in Pre-trial Assessment-A Population-Based Study

Background: The current lack of knowledge about intellectual disability (ID) in forensic psychiatric contexts can compromise the legal certainty of these individuals during the medico-legal process. To address ambiguous results in previous literature, the aim of the current study was to estimate the prevalence of ID in a pre-trial forensic psychiatric settings. Moreover, as little is known about the characteristics of offenders with ID, we conducted a clinical characterization of individuals with and without ID being subject to forensic psychiatric assessment. Methods: Using data from several Swedish national registers, we conducted a population-based retrospective observational study on 8,442 individuals being subject to pre-trial forensic psychiatric assessments in Sweden in 1997-2013. We performed univariate analyses to compare the characteristics of individuals with (n = 537) and without ID (n = 7,905). Results: The prevalence of ID was 6.4% in the Swedish pre-trial forensic psychiatric context during the observational period. Compared with individuals without ID, individuals with ID were younger at the time of assessment, had a lower educational level, and had less frequently started families. ID was associated with lower frequency of diagnosed psychotic and bipolar disorders. However, a similar prescription rate of antipsychotics, and a comparable rate of previous inpatient care was observed among individuals with and without ID. Individuals with ID had more often been prescribed anti-libidinal treatments often used for treating sexual disorders, although did not present a higher prevalence of sexual disorder. Conclusions: The prevalence of ID among pre-trial individuals being subject to forensic psychiatric assessment was more than twice as high as assumed in the general population. Our results suggest that individuals with ID received pharmacotherapy without clear indication. Remaining challenges in the clinical management of individuals with ID were indicated by the discrepancy between the occurrence of psychiatric diagnoses, pharmacological treatment patterns, and rates of inpatient care.

Zolpidem-Associated Consequences: An Updated Literature Review With Case Reports

A post-2000 literature search reviewed prevalence of health consequences associated with zolpidem, plus two salient case reports. Common zolpidem-related harms encompassed accidents, falls, overdoses, delirium, and infections. Risks to others included assaults, vehicular accidents, various crimes, and civil actions that occurred during zolpidem-induced delirium, withdrawal, and other impediments. Remarkably, much harm occurred while patients were taking therapeutic doses of licitly prescribed zolpidem (10-30 mg). Zolpidem-associated health, behavioral, and social problems comprise an international pandemic of preventable heath misfortunes.

Homicide victims and mechanisms in Lithuania from 2004 to 2016

A retrospective analysis of 2000 intentional homicide cases from the State Forensic Medicine Service (Vilnius, Lithuania) was carried out in order to evaluate the portrait of homicide victims and mechanisms of death between 2004 and 2016. The definition of intentional homicide appears to be quite straightforward, as a homicide occurs when one person's cause of death can be attributed to another one. Moreover, homicide is accomplished by conscious, active, intentional, or unintentional activities or inaction. All included cases of homicide were qualified as intentional murder. Children rarely become victims of intentional homicide. The group of child intentional murder made only 4.2% of all homicide cases. Seventy-three percent of homicide victims were male. The female victims were older than male and were murdered using a larger variety of objects (p < 0.001). Heavily alcohol-intoxicated victims were murdered using more traumatic affliction by sharp, stabbing-cutting objects (p < 0.001). The largest number of traumatic afflictions was associated with using a blunt object (p < 0.001). Lithuania differs from other European countries in terms of death by shooting: while 13% of homicides resulted from gunshot wounds in Europe, in Lithuania, only 5.6% of homicides did. This fact can be attributed to a relatively lower firearm ownership in Lithuania. This research is the first study that evaluates homicide in Lithuania based on autopsy findings. This study is highly important for homicide investigation tactics, as it emphasizes the portrait of the victim, providing valuable information about the most common mechanism of death, used weapons and traumatic afflictions for the law enforcement agencies.

Effects of 25 mg oxazepam on emotional mimicry and empathy for pain: a randomized controlled experiment

Emotional mimicry and empathy are mechanisms underlying social interaction. Benzodiazepines have been proposed to inhibit empathy and promote antisocial behaviour. First, we aimed to investigate the effects of oxazepam on emotional mimicry and empathy for pain, and second, we aimed to investigate the association of personality traits to emotional mimicry and empathy. Participants (n=76) were randomized to 25 mg oxazepam or placebo. Emotional mimicry was examined using video clips with emotional expressions. Empathy was investigated by pain stimulating the participant and a confederate. We recorded self-rated experience, activity in major zygomatic and superciliary corrugator muscles, skin conductance, and heart rate. In the mimicry experiment, oxazepam inhibited corrugator activity. In the empathy experiment, oxazepam caused increased self-rated unpleasantness and skin conductance. However, oxazepam specifically inhibited neither emotional mimicry nor empathy for pain. Responses in both experiments were associated with self-rated empathic, psychopathic and alexithymic traits. The present results do not support a specific effect of 25 mg oxazepam on emotional mimicry or empathy.

Effects of 25 mg oxazepam on emotional mimicry and empathy for pain: a randomized controlled experiment

Emotional mimicry and empathy are mechanisms underlying social interaction. Benzodiazepines have been proposed to inhibit empathy and promote antisocial behaviour. First, we aimed to investigate the effects of oxazepam on emotional mimicry and empathy for pain, and second, we aimed to investigate the association of personality traits to emotional mimicry and empathy. Participants (n=76) were randomized to 25 mg oxazepam or placebo. Emotional mimicry was examined using video clips with emotional expressions. Empathy was investigated by pain stimulating the participant and a confederate. We recorded self-rated experience, activity in major zygomatic and superciliary corrugator muscles, skin conductance, and heart rate. In the mimicry experiment, oxazepam inhibited corrugator activity. In the empathy experiment, oxazepam caused increased self-rated unpleasantness and skin conductance. However, oxazepam specifically inhibited neither emotional mimicry nor empathy for pain. Responses in both experiments were associated with self-rated empathic, psychopathic and alexithymic traits. The present results do not support a specific effect of 25 mg oxazepam on emotional mimicry or empathy.

Patterns of homicide in North Tunisia: a 10-year study (2005–2014)

Background

In Tunisia and in the Arab world, few data are available about homicide patterns. The aim of our study was to analyse the victims' profiles and the general pattern.

Methods

636 homicide victims were autopsied at the Legal Medicine Department of Charles Nicolle Hospital in Tunis, over a period of 10 years (2005–2014).

Results

Victims were males in 79.7% with a male-to-female ratio of 3.93 and the average age was 37.7 years. The victim was generally from an urban area (66.7%), single (55.7%) and semiskilled (50.2%). The most common methods of homicide were sharp force (51.7%) and blunt trauma (24.8%).

Conclusions

This study suggests applying urgent preventive measures targeting essentially young males and the importance of a national ‘Violence Repository’.

Comparing Homicide-Suicides in the United States and Sweden

Research on homicides followed by suicides has largely relied on very localized samples and relatively short time spans of data. As a result, little is known about the extent to which patterns within cases of homicide-suicides are geographically specific. The current study seeks to help fill this gap by comparing twenty years of homicide-suicide data for Sweden and a large U.S. county. Although some of the underlying patterns in the two countries are similar (e.g., decreasing rates), a number of important differences emerge, particularly with respect to incidence, weapons used, perpetrator age, and relationship of the perpetrator to the victim.

Hypnotic drug risks of mortality, infection, depression, and cancer: but lack of benefit

This is a review of hypnotic drug risks and benefits, reassessing and updating advice presented to the Commissioner of the Food and Drug Administration (United States FDA). Almost every month, new information appears about the risks of hypnotics (sleeping pills). The most important risks of hypnotics include excess mortality, especially overdose deaths, quiet deaths at night, infections, cancer, depression and suicide, automobile crashes, falls, and other accidents, and hypnotic-withdrawal insomnia. Short-term use of one-two prescriptions is associated with greater risk per dose than long-term use. Hypnotics have usually been prescribed without approved indication, most often with specific contraindications, but even when indicated, there is little or no benefit. The recommended doses objectively increase sleep little if at all, daytime performance is often made worse, not better, and the lack of general health benefits is commonly misrepresented in advertising. Treatments such as the cognitive behavioral treatment of insomnia and bright light treatment of circadian rhythm disorders offer safer and more effective alternative approaches to insomnia.

Hypnotic drug risks of mortality, infection, depression, and cancer: but lack of benefit

This is a review of hypnotic drug risks and benefits, reassessing and updating advice presented to the Commissioner of the Food and Drug Administration (United States FDA). Almost every month, new information appears about the risks of hypnotics (sleeping pills). This review includes new information on the growing USA overdose epidemic, eight new epidemiologic studies of hypnotics' mortality not available for previous compilations, and new emphasis on risks of short-term hypnotic prescription. The most important risks of hypnotics include excess mortality, especially overdose deaths, quiet deaths at night, infections, cancer, depression and suicide, automobile crashes, falls, and other accidents, and hypnotic-withdrawal insomnia. The short-term use of one-two prescriptions is associated with greater risk per dose than long-term use. Hypnotics are usually prescribed without approved indication, most often with specific contraindications, but even when indicated, there is little or no benefit. The recommended doses objectively increase sleep little if at all, daytime performance is often made worse, not better, and the lack of general health benefits is commonly misrepresented in advertising. Treatments such as the cognitive behavioral treatment of insomnia and bright light treatment of circadian rhythm disorders might offer safer and more effective alternative approaches to insomnia.

Hypnotic drug risks of mortality, infection, depression, and cancer: but lack of benefit

This is a review of hypnotic drug risks and benefits. Almost every month, new information appears about the risks of hypnotics (sleeping pills). The most important risks of hypnotics include excess mortality (especially overdose deaths, quiet deaths at night, and suicides), infections, cancer, depression, automobile crashes, falls, other accidents, and hypnotic-withdrawal insomnia. Short-term use of one-two prescriptions is associated with even greater risk per dose than long-term use. Hypnotics have usually been prescribed without approved indication, most often with specific contraindications, but even when indicated, there is little or no benefit. The recommended doses objectively increase sleep little if at all, daytime performance is often made worse (not better) and the lack of general health benefits is commonly misrepresented in advertising. Treatments such as the cognitive behavioral treatment of insomnia and bright light treatment of circadian rhythm disorders offer safer and more effective alternative approaches to insomnia.

Intra- and extra-familial child homicide in Sweden 1992-2012: A population-based study

Previous studies have shown decreasing child homicide rates in many countries - in Sweden mainly due to a drop in filicide-suicides. This study examines the rate of child homicides during 21 years, with the hypothesis that a decline might be attributable to a decrease in the number of depressive filicide offenders (as defined by a proxy measure). In addition, numerous characteristics of child homicide are presented. All homicide incidents involving 0-14-year-old victims in Sweden during 1992-2012 (n = 90) were identified in an autopsy database. Data from multiple registries, forensic psychiatric evaluations, police reports, verdicts and other sources were collected. Utilizing Poisson regression, we found a 4% annual decrease in child homicides, in accordance with prior studies, but no marked decrease regarding the depressive-offender proxy. Diagnoses from forensic psychiatric evaluations (n = 50) included substance misuse (8%), affective disorders (10%), autism-spectrum disorders (18%), psychotic disorders (28%) and personality disorders (30%). Prior violent offences were more common among offenders in filicides than filicide-suicides (17.8% vs. 6.9%); and about 20% of offenders in each group had previously received psychiatric inpatient care. Aggressive methods of filicide predominated among fathers. Highly lethal methods of filicide (firearms, fire) were more commonly followed by same-method suicide than less lethal methods. Interestingly, a third of the extra-familial offenders had an autism-spectrum disorder. Based on several findings, e.g., the low rate of substance misuse, the study concludes that non-traditional risk factors for violence must be highlighted by healthcare providers. Also, the occurrence of autism-spectrum disorders in the present study is a novel finding that warrants further investigation.