post mortem interval

Algor Mortis

The loss of body heat in the corpse, typically losing about 1 ½ degrees Fahrenheit per hour until reaching environmental temperature.

Liver Mortis

The setting of blood in small vessels due to gravity, which helps indicate body position after death.

Rigor Mortis

The stiffening of the body that occurs within two hours of death, peaking at 8-12 hours and generally disappearing within 36 hours.

Decomposition

The process by which the body breaks down after death, influenced by environmental conditions such as temperature and humidity.

Putrefaction

• typically manifest itself in the abdomen as 

  • swelling of tissues/bloating 

  • foul smell

  • black or blue discoloration of tissue

  • protrusion of the eyes or tongue 

  • ultimately resulting in slippage of skin and purging of fluids

Post-Mortem Interval

The time elapsed since death, which can be estimated through various methods including body temperature, decomposition, and insect activity.

Forensic Entomology

The study of insect activity to estimate the post-mortem interval based on the life cycles of insects.

Fly Activity

Flies will begin to lay eggs on an exposed corpse within 20 minutes of death, often in moist openings.

What are the moist openings flies like to lay their eggs in?

• nostrils 

• corners of the eyes

• mouth

• open injuries 

• any other opening that is exposed

Primary Insects of Interest in post mortem interval

The main insects that assist in post-mortem interval estimation, including blow flies, beetles, and wasps.

Environmental Factors in Decomposition

Key elements affecting decomposition rates, including geographical location, climate, and weather conditions.

By observing and collecting the various stages of flies present on the body and in the scene…

an entomologist may be able to estimate the post mortem interval