Suicidal cases involving sodium nitrite have been reported worldwide. However, postmortem features, such as brownish or grayish livor mortis, remain difficult to interpret, especially as decomposition advances. Here, we present three fatal cases (2020-2023) presumably caused by sodium nitrite ingestion. In these cases, characteristic nitrite-induced changes were inconsistent or obscured by decomposition, but ingestion traces (cup or bottle near the decedents) were observed at each scene. Additionally, containers labeled “sodium nitrite” were found in two cases; however, since sodium nitrite is designated a suicide-hazardous material in South Korea, future scenes may rarely reveal such clear labeling. Although autopsy, including methemoglobin testing, can confirm the cause of death, any delay in the investigative process risks the loss of critical evidence about the ingestion process and other factors. This underscores the importance of focusing on early scene evidence, particularly ingestion traces, and conducting thorough chemical and forensic examinations. Our findings illustrate that timely detection of ingestion-related evidence and subsequent forensic analysis, in conjunction with autopsy results, can elucidate a decedent’s cause and manner of death and clarify any criminal implications.

This case study highlights craniofacial identification technology (CFIT) as a complementary and translational tool for reconstruction of cranial gunshot wounds (GSWs) and presenting evidence beyond forensic identification. In forensic cases involving GSWs, a visual demonstration of the bullet trajectory can improve communication between forensic pathologists and non-medical judicial agencies and the court. Postmortem computed tomography (PMCT) images and autopsy images are essential medical evidence, providing a robust visual display of the GSW and its bullet trajectory. PMCT images are useful for identifying the precise projectile localization and characteristics of bone fractures. However, PMCT images may not adequately present soft tissue injuries well, and autopsy images can be unpleasant to non-medical professionals, making it difficult for them to understand such specialized scientific evidence. CFIT is a well-established scientific tool with which forensic experts in craniofacial identification can create more advanced reconstructed three-dimensional (3D) images based on both postmortem findings and PMCT data. Intracranial bullet trajectory can be shown simply and directly in reconstructed 3D cranial images. CFIT can serve as an adjunctive tool to overcome the limitations of both PMCT images and autopsy images, thereby facilitating better understanding of such specialized medical evidence by non-medical professionals. Here, we present two cases of head GSWs, in which CFIT was newly implemented to reconstruct the cranial GSW including bullet trajectory, for evidence presentation—expanding its traditional use in forensic identification. Therefore, CFIT can help provide better forensic medical services for non-medical professionals.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection contribute to platelet activation and thrombus formation. Severe coronavirus disease 2019 (COVID-19) is characterized by an increased risk of thromboembolic events that can lead to adverse outcomes in patients with severe disease manifestations. We present the case of a 41-year-old man who died from a pulmonary embolism and review the connection between SARS-CoV-2 infection, increased platelet counts, and the resulting fatal thrombosis. Total knee replacement surgery was performed and the patient was able to ambulate for a few days postoperatively. The platelet count exceeded the upper limit between postoperative days six and nine, reaching 708,000/μL on day 20. SARS-CoV-2 was confirmed 14 days after surgery, and the patient died 23 days after surgery while hospitalized. Autopsy revealed a fatal pulmonary embolism and deep vein thrombosis. If blood clots are caused by increased platelet counts due to COVID-19, it is essential to understand this relationship and prepare for complications that may arise after infection. Several recent studies have shown a link between COVID-19 and coagulation. We propose several considerations for autopsies of unexpected fatal pulmonary embolism during the SARS-CoV-2 endemic period.

Non-thrombotic pulmonary embolism (NTPE) is a rare but potentially fatal complication of filler injections. It can result not only from direct intravascular injection but also from the migration of fillers into veins due to local pressure. Here, we report the autopsy findings of two deaths resulting from NTPE following vaginal filler injections. The first case involved a 38-year-old woman who lost consciousness 20-40 minutes after receiving an injection of 15 mL of hyaluronic acid (HA) filler. A large amount of filler was observed in the vagina with gross embolization of the paravaginal vessels. Microscopic examination revealed HA embolism in the lungs. Despite treatment, the patient died 10 days after the procedure. The second case involved a 35-year-old woman who experienced desaturation and cardiac arrest 4 minutes after receiving a collagen filler and a hybrid filler consisting of HA and polylactic acid. An autopsy revealed NTPE and systemic embolism of the collagen filler. She died 1 month after treatment in the intensive care unit. The vagina poses a significant risk for filler injections owing to its rich venous plexus. Doctors should be fully aware of this risk, and a complete autopsy should be performed in such cases.

In forensic science, age estimation is essential for identifying both living and deceased individuals. Teeth and jawbones serve as reliable indicators due to their gradual age-related changes and resistance to environmental factors. Among the various methods, attrition and pulp cavity size are commonly used to estimate adult age. This study aimed to enhance the accuracy of age estimation in Korean adults by combining measurements of tooth attrition and pulp cavity size obtained from panoramic radiographs of mandibular first molars. We evaluated 118 patients (62 male, 56 female) who visited Pusan National University Dental Hospital between 2010 and 2024. Radiographs and clinical photographs were analyzed for grade C teeth with exposed dentin using Takei’s method, and the pulp chamber height ratio (PCHR) and width ratio (PCWR) were measured using Jeon’s method. Intraobserver reliability was high (intraclass correlation coefficient>0.6), with no significant sex-based differences in PCHR and PCWR. Both ratios negatively correlated with age, with PCWR showing a stronger correlation, particularly in females (r=–0.606). This study derived an improved age estimation formula with R² values ranging from 0.540 to 0.546 when both PCHR and PCWR were combined. Despite the limitations of this study, such as its small sample size and reliance on panoramic radiographs, the findings suggest that combining tooth wear and pulp cavity size offers a more robust tool for age estimation in clinical and forensic settings.

Spontaneous coronary artery dissection (SCAD) is a condition in which an intramural hematoma within the coronary artery leads to acute coronary syndrome without atherosclerosis, trauma, or iatrogenic causes. It predominantly affects middle-aged women and is associated with several predisposing conditions, including fibromuscular dysplasia, systemic inflammatory disorders, connective tissue diseases, and coronary artery spasms. We report the case of a 64-year-old male with a history of hypertension who died of SCAD. His death occurred suddenly and without preceding trauma while the decedent was working overtime at a construction site. On gross examination, a thrombus-like material was identified in a branch of the left anterior descending artery and was initially presumed to be a postmortem clot. However, microscopic examination revealed an intramural hemorrhage, medial dissection, and formation of a false lumen within the coronary artery. This case report highlights the importance of a thorough histopathological examination of the coronary arteries during autopsy, even in the absence of atherosclerosis.

Fecal impaction (FI) is a potentially fatal condition characterized by the accumulation of large, hardened fecal masses in the large intestine, resulting in mechanical obstruction. This condition is commonly observed in older adults but can also affect younger populations, particularly patients with psychiatric conditions who face increased risk due to medication side effects, autonomic dysfunction, and inadequate bowel management. This report describes two forensic autopsy cases of fatal FI in patients with neuropsychiatric disorders. The first case involved a 52-year-old man with mild intellectual disability who had received long-term psychiatric treatment. Autopsy findings included marked colonic dilation (maximum diameter >10 cm), ischemic mucosal changes, and a large fecal mass (~2,200 g) obstructing the sigmoid and descending colon. The second case involved a 25-year-old man with severe intellectual disability. Autopsy revealed severe colonic dilation (maximum diameter of 12 cm), extensive FI along rectum and descending colon, and no evidence of alternative causes of death. In both cases, death was attributed to mechanical intestinal obstruction secondary to FI. These cases highlight the forensic significance of FI as a cause of sudden death in patients with neuropsychiatric disorders. Symptoms such as paradoxical diarrhea may be misinterpreted, and the inadvertent use of contraindicated medications (e.g., antidiarrheals) can worsen the condition, contributing to fatal outcomes. Furthermore, forensic evaluation must assess whether inadequate medical intervention or neglect played a role in the progression of FI. Early recognition, proactive bowel management, and interdisciplinary collaboration are critical to preventing fatal events in high-risk patients with neuropsychiatric disorders.

Tuberculosis (TB) remains a significant global health issue, with undiagnosed cases posing risks to public health and forensic personnel. Forensic autopsies are important in identifying TB cases, as undetected infections in deceased individuals can lead to occupational exposure through aerosolized transmission. However, TB surveillance in forensic autopsies remains insufficient, limiting its recognition in public health strategies. This study analyzed 43,190 forensic autopsies conducted in South Korea from 2019-2023, identifying 195 TB cases (0.45%), including 114 deaths (0.26%) primarily caused by TB. The highest prevalence was recorded in 2019 (0.59%), with a gradual decline in subsequent years. Regional analysis showed that Incheon had the highest TB prevalence (0.74%). Pulmonary TB was the most common (80.77%), followed by miliary TB (15.38%). These findings highlight the potential occupational risks for forensic personnel because of undiagnosed TB infections. Notably, 72.3% of TB cases were identified postmortem without previous medical records, increasing the likelihood of unprotected exposure. Additionally, forensic investigations often lack systematic reporting of TB cases, making it difficult to assess the true prevalence and risks. Strengthening TB monitoring in forensic autopsies can enhance case identification and improve public health surveillance. Establishing a more structured reporting system for TB cases in forensic settings may help prevent occupational exposure and support national TB control efforts.

The field of forensic toxicology faces significant challenges when assessing toxic substances whose blood concentrations do not correlate proportionally with toxicity. A representative example of such substances is uncouplers, which induce apoptosis via mitochondrial dysfunction, leading to delayed toxicity. In this study, we examined domestic intoxication cases involving uncouplers, with particular focus on chlorfenapyr, a widely recognized uncoupler. Symptoms observed in poisoning cases included initial vomiting, abdominal pain, and diarrhea, followed by hyperthermic episodes, rhabdomyolysis, optic nerve damage, pancreatitis, brain damage, and, ultimately, death occurring days to weeks later. In fatal cases, the blood concentration of chlorfenapyr was found to be below 1 ppm (ranging from tens to hundreds of ppb), making it easily overlooked in routine toxicological screenings. Furthermore, due to its delayed toxic effects, chlorfenapyr may not be detected in gastric contents, necessitating careful forensic evaluation. In negative chlorfenapyr cases presenting with hyperthermic episodes and signs of cell death, exposure to other uncouplers should be considered. Clinical cases reviewed in this study suggest that ingesting as little as 20 mL of pesticide products containing chlorfenapyr can lead to death weeks later, highlighting the severe delayed toxicity of this compound. Therefore, regulatory policies governing its use should be reinforced, and the development of alternative pesticides should be considered to mitigate fatal risks.

Suicidal cases involving sodium nitrite have been reported worldwide. However, postmortem features, such as brownish or grayish livor mortis, remain difficult to interpret, especially as decomposition advances. Here, we present three fatal cases (2020-2023) presumably caused by sodium nitrite ingestion. In these cases, characteristic nitrite-induced changes were inconsistent or obscured by decomposition, but ingestion traces (cup or bottle near the decedents) were observed at each scene. Additionally, containers labeled “sodium nitrite” were found in two cases; however, since sodium nitrite is designated a suicide-hazardous material in South Korea, future scenes may rarely reveal such clear labeling. Although autopsy, including methemoglobin testing, can confirm the cause of death, any delay in the investigative process risks the loss of critical evidence about the ingestion process and other factors. This underscores the importance of focusing on early scene evidence, particularly ingestion traces, and conducting thorough chemical and forensic examinations. Our findings illustrate that timely detection of ingestion-related evidence and subsequent forensic analysis, in conjunction with autopsy results, can elucidate a decedent’s cause and manner of death and clarify any criminal implications.