A Silent Conspiracy: A Rare Case of Homicidal Strangulation with Toxicological Confirmation of Paraphenylenediamine Poisoning

Abstract

Homicidal deaths involving multiple mechanisms of injury present complex challenges for forensic investigation. The present case report describes the medico-legal investigation of a 34-year-old male who died following a combination of ligature strangulation and toxicological poisoning with paraphenylenediamine (PPD). The victim, a resident of southern Punjab, Pakistan, was reportedly involved in a dispute related to financial matters prior to the incident. According to investigative accounts, the individual was assaulted, strangled with a ligature material, and forcibly administered a toxic chemical substance suspected to be PPD. The victim was transported to a tertiary care hospital in critical condition exhibiting neck compression marks, cranial trauma, and signs consistent with toxic ingestion. Despite emergency medical intervention, the patient died approximately forty-eight hours after admission. Medico-legal autopsy revealed distinct ligature marks around the neck, blunt force trauma to the scalp, fracture of the hyoid bone, and chemical burns within the gastrointestinal tract. Toxicological examination of biological samples confirmed the presence of toxic concentrations of paraphenylenediamine in both blood and gastric contents. The findings established traumatic asphyxia due to ligature strangulation as the primary cause of death, with systemic toxicity due to PPD ingestion as a contributory factor. This case highlights the critical role of integrated forensic pathology and toxicology in identifying complex homicidal mechanisms and underscores the importance of multidisciplinary collaboration in medico-legal investigations.