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Homicide Chapter 12 Ol
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Homicide Chapter 12 Ol

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  • 1. South Puget Sound Community College Forensic Homicide Investigation
  • 2. Modes of Death Investigators must be familiar with manner, means, causes and modes of death GSW Cutting wounds Stabbing wounds Blunt force injuries Poisons Asphyxia (autoerotic) Arson/fire
  • 3. Modes of Death  GSW: Weapon discharged four things happen: 1. Fire/flame emitted from barrel 2. Smoke follows flame 3. Bullet emerges 4. Additional smoke/grains of unburned powder follow. Material spreads out like a funnel As distance from gun increases density of pattern decreases
  • 4. Modes of Death PROJECTILE STRIKING THE BODY: Two basic wounds 1. Entrance: a. Generally smaller than exit b. Typically round neat hole w/abrasion collar c. Comparatively small amounts of blood 2. Exit: a. Generally larger than entrance b. Ragged/torn in appearance/tissue extruding c. Generally more blood
  • 5. NATURE/EXTENT OF GSW: Number of factors=characteristics -distance -ricocheting -type of ammo -passage thru body -passage thru clothes -type of weapon -part of body
  • 6. Modes of Death Human skin- -elastic/resistant -bullet causes indentation -perforates/bores thru skin: 1. circular hole 2. abrasion collar/blackening effects around edges 3. stretched skin then closes back Once inside body: -generally travels in straight line -contact w/bone deflects
  • 7. Modes of Death SMUDGE/SMOKE: -smoke/soot deposited into wound -wound is dirty/grimy looking -easily wiped off -close but not in contact -hold clothes for exam SEARING: -yellow singed effect due to flame from gun TATTOOING/STIPPLING: (2-4 feet away) -pinpoint hemorrhages from powder -unburned powder in skin -cannot be wiped off
  • 8. CONTACT WOUNDS: (stellate wounds) -muzzle is held directly against skin -shape is the result of bullet/flames/gases -larger than diameter of bullet -wound gaping/dirty -edges ragged/torn -tissue charring -large tissue destruction -muzzle stamp/brand
  • 9. Modes of Death CUTTING INJURIES: -incision/straight cut -minimum bruising -longer than deep -freely bleeding -no indication of type of instrument STABBING INJURIES: -piercing wounds -deeper than wide -damage to organs underneath -internal bleed w/little or no external blood -possible indication of type of instrument -
  • 10. Modes of Death BLUNT FORCE TRAUMA: -usually evident by external trauma -laceration-jagged edged wound -bruising-bleeding under the skin
  • 11. Modes of Death CHOPPING INJURIES: -heavy objects with sharp edges -axes -injury to skin and heavy damage underneath
  • 12. Modes of Death ASPHYXIA: I. Strangulation a. manual-hand, body parts b. Ligature-anything-impression marks Investigative considerations- 1. Presence of abrasions/bruising 2. -petechial hemorrhages 3. Possible trauma to tongue II. Hanging -generally suicidal or accidental
  • 13. Modes of Death  Considerations:  1. body need not be completely off the floor  2. Small/ropelike ligatures leave deep grooves across neck-higher up  3. black and blue lines appear w/in groove line  4. lividity will be prominent in head/legs
  • 14. Modes of Death III. DROWNING -liquid gets into air passages and prevents air from getting to lungs -mouth/nose only covered IV. INHALATION OF POISON -most common carbon monoxide -pink skin V. SUFFOCATION-passage of air through mouth/nose blocked -smothering -choking -inhalation -mechanical asphyxia
  • 15. Modes of Death FIRE: -generally from smoke first -pugilistic pose -cracks open from heat -white froth from mouth-alive at time of fire -ME is only one who can determine fire or other cause of death
  • 16. Modes of Death AUTO EROTIC: -each unique to due to fantasy FIVE CRITERIA: -evidence of self-release mechanism -evidence of solo sex activity -evidence of sexual fantasy aids -evidence of prior practice -no apparent suicidal intent