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Date: May 6, 2013

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.

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Date: May 6, 2013

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  1. 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

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

  3. Agenda • Rigor Mortis • Estimation of time of Death • Factors affecting Estimate • Algor Mortis • Estimation of time of Death • Factors affecting Algor Mortis

  4. Rigor Mortis 12 hrs – peak rigor 48 hrs 0 hrs

  5. Factors Affecting Rigor Mortis • Temperature • Body Weight • Clothing • Illness • Exercise • Sun Exposure

  6. Factors Affecting Rigor Mortis • Can change estimate • Adjust estimate accordingly

  7. Rigor Mortis 12 hrs – peak rigor 48 hrs 0 hrs

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

  9. Practice Complete problems 6 – 9 on the worksheet.

  10. Rigor Mortis 12 hrs – peak rigor 48 hrs 0 hrs

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

  12. 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

  13. Factors Affecting Algor Mortis • Environment • Temperature • Body Fat • Clothing

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

  15. Estimating Time of Death – Algor Mortis • Body loses heat over time • Living Body Temperature – 37° C (98.6° F)

  16. 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

  17. 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

  18. 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

  19. 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

  20. Estimating Time of Death – Algor Mortis • Complete the worksheet problems

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

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