[Unusual cases of self-asphyxiation]

Area of Science:

• Forensic pathology
• Criminology

Background:

• Differential diagnosis in strangulation deaths is critical for legal and investigative purposes.
• Distinguishing between suicide and homicide in cases involving complex ligature use presents unique challenges.

Observation:

• The study examines four cases of self-strangulation involving multiple knots in the ligating device.
• Key forensic indicators such as multiple knots, trapped hair, clothing fragments, and associated injuries were analyzed.
• The presence and significance of head congestion symptoms were specifically evaluated.

Findings:

• While multiple knots, trapped materials, and injuries can occur in suicides, they are primary indicators of homicidal strangulation.
• In rare instances of self-strangulation with multiple knots, the presence of head congestion symptoms is a necessary pathophysiological finding.
• Absence of head congestion may not rule out strangulation but is a key differentiator in complex knotting scenarios.

Implications:

• These findings refine forensic criteria for differentiating suicide from homicide in complex strangulation cases.
• Enhanced understanding aids investigators and legal professionals in accurately interpreting evidence from death investigations.
• The study highlights the importance of detailed examination of ligature devices and associated physical findings in forensic casework.