Aim SWBAT explain what causes algor mortis and

Aim: SWBAT explain what causes algor mortis, and use algor mortis evidence to estimate time of death Date: May 6, 2013 Do Now: In one sentence, explain how you would estimate time of death using rigor mortis

Estimating Time of Death using Rigor Mortis 1. 2. Identify portion of body exhibiting (or not exhibiting rigor) Use table to identify time period

Agenda �Rigor Mortis �Estimation of time of Death �Factors affecting Estimate �Algor Mortis �Estimation of time of Death �Factors affecting Algor Mortis

Rigor Mortis 12 hrs – peak rigor 48 hrs 0 hrs

Factors Affecting Rigor Mortis �Temperature �Body Weight �Clothing �Illness �Exercise �Sun Exposure

Factors Affecting Rigor Mortis �Can change estimate �Adjust estimate accordingly

Rigor Mortis 12 hrs – peak rigor 48 hrs 0 hrs

Estimating time of Death Using Rigor Mortis 1. 2. Man found dead buried in snow. Rigor in the legs only. Woman dies during the summer, exhibits no rigor.

Practice Complete problems 6 – 9 on the worksheet.

Rigor Mortis 12 hrs – peak rigor 48 hrs 0 hrs

Review 6. 12 - 24 hours ago 7. 2 -6 hours 8. Cannot be determined, more evidence needed 9. 24 – 48 hours

Algor Mortis �Death Heat �Body Temp – Living 37 C (98. 6 F) �Body fails, heat leaves body �Temp taken from liver �Estimate Time of Death

Factors Affecting Algor Mortis 1. 2. 3. 4. Environment Temperature Body Fat Clothing

Red Light �In your notebooks, answer the following question: What causes algor mortis?

Estimating Time of Death – Algor Mortis � Body loses heat over time � Living Body Temperature – 37° C (98. 6° F)

Estimating Time of Death – Algor Mortis �A man is found on the side of the road. His body temperature is 32° C. How long has this man been dead? � 6 hrs 25 mins

Steps: �Calculate how many degrees have been lost �Greater or less than 12 hrs? (9. 36° C) �Calculate any time left over. ◦ Multiply decimal by 60 to get mins

Estimating Time of Death – Algor Mortis �A woman is found dead. Her body temperature is 28° C. How long has this woman been dead? � 11 hrs 32 mins

Estimating Time of Death – Algor Mortis �A woman is found dead. Her body temperature is 20° C. How long has this woman been dead? � 31 hrs 38 mins

Estimating Time of Death – Algor Mortis � Complete the worksheet problems

Red Light �In your notebooks, write the steps you would take to estimate time of death using algor mortis.