Signs of death given in essentials of forensic medicine and toxicology by K.S. Narayan Reddi
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Signs of Death
Essentials of Forensic Medicine and Toxicology - K.S. Narayan Reddi (36th Ed., 2026)
The textbook organizes postmortem changes (and hence signs of death) into three sequential stages:
Sequential Postmortem Changes (Table 7.1)
| Stage | Key Changes |
|---|---|
| Immediate (somatic death) | Insensibility and loss of voluntary power; Cessation of respiration; Cessation of circulation |
| Early (cellular death) | Pallor and loss of elasticity of skin; Changes in the eye; Primary flaccidity of muscles; Cooling of the body; Postmortem lividity; Rigor mortis |
| Late (decomposition and decay) | Putrefaction; Adipocere formation; Mummification |
I. IMMEDIATE CHANGES
These are also called uncertain/probable signs of death because they can occur in suspended animation.
1. Insensibility and Loss of Movement
- The earliest sign of death.
- Can be misleading - occurs in prolonged fainting, vagal inhibition, epilepsy, trance, catalepsy, narcosis, electrocution, etc.
2. Cessation of Respiration
- Must be complete and continuous to be significant.
- Stethoscope is placed over the upper lungs and larynx.
- Complete stoppage for more than 5 minutes usually causes death.
- Respiration can stop temporarily without causing death: (1) voluntary act, (2) Cheyne-Stokes breathing, (3) drowning, (4) newborn infants.
- Feather test, mirror test, and Winslow's test are of historical importance only.
3. Cessation of Circulation
- Stethoscope placed over the precordial area.
- Stoppage of heartbeat for more than 5 minutes is irrecoverable under normal conditions and is accepted as evidence of death.
- (Thumb test, tourniquet test, and heat test are of historical importance only.)
II. EARLY CHANGES
4. Changes in the Skin
- Skin on the face becomes pale and ashy/white and loses elasticity within a few minutes of death.
- Lips appear dark red to black, dry and hard due to drying.
5. Changes in the Eyes
| Change | Details |
|---|---|
| Loss of corneal reflex | Found in deep insensibility (epilepsy, narcotic poisoning, anaesthesia) - not a reliable sign |
| Opacity of cornea | May occur in cholera/wasting diseases before death; delayed ~2 hours if eyelids are closed |
| Tache noire | Yellow triangles of cell debris and mucus on sclera (base toward corneal margin, apex toward canthus), turning brown then black within 3-4 hours when eyelids are open |
| Flaccidity of eyeball | Eyes appear sunken; intraocular tension drops (normal 14-25 g → <12 g soon after → <3 g at 30 min → nil at 2 hours) |
| Pupils | Slightly dilated immediately after death (iris muscle relaxation); later constricted with rigor mortis of constrictor muscles; react to atropine/eserine for ~1 hour but not to light |
| Retinal vessels (Kevorkian sign) | Fragmentation/segmentation of blood columns - appears within minutes, persists ~1 hour |
| Vitreous humor | Steady rise in potassium after death, up to 100 hours (useful for time since death estimation) |
6. Primary Flaccidity of Muscles
- Death is only somatic at this stage (no cellular death yet); lasts 1-2 hours.
- Lower jaw falls, eyelids lose tension, joints are flexible.
- Body flattens over contact areas (contact flattening).
- Muscular irritability and response to mechanical/electrical stimuli persist.
- Peristalsis, ciliary movements, and white cell movements may continue.
- Loss of sphincter tone may cause emptying of bladder.
- Muscle protoplasm is slightly alkaline.
7. Algor Mortis (Cooling of the Body)
- After death, metabolic activity stops; body loses heat by conduction, convection, and radiation.
- Cooling curve is sigmoid (inverted 'S') shaped.
- Linear cooling rate of 0.4-0.6°C per hour for the next 12-16 hours.
- Body rarely reaches ambient temperature completely.
- Formula for approximate time since death:
(Normal body temperature - Rectal temperature) / Rate of temperature fall per hour
8. Postmortem Lividity (Hypostasis)
- Settling of blood to dependent parts.
- Appears around 2-3 hours post death; becomes fixed at 6-12 hours.
9. Rigor Mortis (Cadaveric Rigidity)
- Stiffening of muscles due to individual cell death (accumulation of lactic acid, ATP depletion, actin-myosin cross-bridge locking).
- Appears in order: jaw → neck → trunk → upper limbs → lower limbs (Nysten's law).
III. LATE CHANGES (Absolute/Certain Signs of Death)
These are positive/certain signs that confirm death with no ambiguity:
10. Putrefaction
- Decomposition by bacteria; greenish discolouration first appears in the right iliac fossa (usually 2-3 days in summer).
- Rigor mortis passes off and gases are produced (bloating, marbling, bullae formation).
11. Adipocere Formation
- Saponification of body fat; body fat converts to a soap-like material (hydroxy fatty acids).
- Requires moist environment; starts within 3-4 weeks.
12. Mummification
- Desiccation of the body in hot, dry conditions.
- Body is preserved in a dry, hard, brown shrunken state.
Key Distinction: Uncertain vs. Certain Signs
| Category | Signs |
|---|---|
| Uncertain/Probable signs (can occur in suspended animation) | Insensibility, cessation of respiration, cessation of heartbeat, pallor, eye changes, flaccidity |
| Certain/Positive/Absolute signs | Putrefaction, adipocere, mummification (late postmortem changes) |
"A knowledge of the signs of death help to differentiate death from suspended animation." - The Essentials of Forensic Medicine and Toxicology, 36th ed., p.158
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