FM3.2 | Hanging & Strangulation — Summary & Reflection

KEY TAKEAWAYS

Hanging, ligature strangulation, and throttling share the common mechanism of neck compression causing cerebral venous hypertension and hypoxia, but differ critically in the source of force and the resulting PM signs.

In hanging, the force is body weight. The ligature mark is ABOVE the thyroid cartilage, OBLIQUE (angled upward toward the suspension point), and DISCONTINUOUS at the knot. Death mechanisms include venous obstruction (dominant), arterial compression, vagal inhibition, and — only in judicial/long-drop hanging — hangman's fracture (C2-C3). Facial appearance may be pale or congested depending on type.

In ligature strangulation, the force is externally applied. The mark is AT or BELOW the thyroid cartilage, HORIZONTAL, and CONTINUOUS around the circumference. Prominent facial congestion and petechiae are characteristic. This is almost always homicide in adults.

Throttling is manual strangulation — always homicide. Crescent-shaped fingernail abrasions and oval fingertip bruises on the neck are pathognomonic. Hyoid fracture occurs more commonly in throttling than in hanging.

Ligature preservation is a critical forensic act: always cut AWAY from the knot, never untie it, preserve in paper, maintain chain of custody, and dispatch to the FSL with a specific query.

The IPC frame: homicidal neck compression — IPC 302 or 304 depending on intent. The forensic physician's role is to establish cause and mechanism of death and whether the PM findings are consistent or inconsistent with the proposed manner; the court determines IPC culpability.

REFLECT

Return to the hook scenario. The forensic medical officer notes: (1) horizontal ligature mark at the thyroid cartilage level, continuous, (2) fingernail abrasions on the front of the neck, and (3) marked facial congestion with subconjunctival petechiae. The husband's account describes finding her suspended. How would you reconcile the PM findings with the scene? What are the steps for preserving the evidence? If you were asked in court 'In your opinion, was this a suicide or a murder?' — how would you answer? What is the appropriate formulation of a forensic opinion when findings point toward homicide but scene circumstances appear consistent with suicide?