date: may 6, 2013
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Aim: SWBAT explain what causes algor mortis, and use algor mortis
evidence to estimate time of death
Date: May 6, 2013Do Now: In one sentence,
explain how you would estimate time of death using rigor mortis
1. Identify portion of body exhibiting (or not exhibiting rigor)
2. Use table to identify time period
Estimating Time of Death using Rigor Mortis
Rigor Mortis Estimation of time of DeathFactors affecting EstimateAlgor MortisEstimation of time of DeathFactors affecting Algor Mortis
Agenda
Rigor Mortis
0 hrs
48 hrs
12 hrs – peak rigor
TemperatureBody WeightClothing IllnessExerciseSun Exposure
Factors Affecting Rigor Mortis
Can change estimateAdjust estimate accordingly
Factors Affecting Rigor Mortis
Rigor Mortis
0 hrs
48 hrs
12 hrs – peak rigor
1. Man found dead buried in snow. Rigor in the legs only.
2. Woman dies during the summer, exhibits no rigor.
Estimating time of Death Using Rigor Mortis
Complete problems 6 – 9 on the worksheet.Practice
Rigor Mortis
0 hrs
48 hrs
12 hrs – peak rigor
6. 12 - 24 hours ago7. 2-6 hours8. Cannot be determined, more evidence needed9. 24 – 48 hours
Review
Death HeatBody Temp – Living 37 C
(98.6 F)Body fails, heat leaves bodyTemp taken from liverEstimate Time of Death
Algor Mortis
1. Environment2. Temperature3. Body Fat4. Clothing
Factors Affecting Algor Mortis
In your notebooks, answer the
following question: What causes algor
mortis?
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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
Estimating Time of Death – Algor Mortis
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
Steps:
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
Estimating Time of Death – Algor Mortis
In your notebooks, write the steps you
would take to estimate time of death using
algor mortis.
Red Light