Determine Cause Of Death

You may examine a dead creature to figure out what killed it. For every 5 points that the autopsy check exceeds the DC you can determine additional details about the death. For example; if an autopsy was performed on a creature killed by an obvious stab wound and the result is a 12, the coroner can determine that the instrument was an iron knife and the knife was 6 inches long. If they had rolled a 15 then they would have picked up the slight angle to the wound which illustrated that the attacker was also right handed.

Cause of Death	DC
Physical Wounds	0
Environmental (fire, suffocation)	5
Spell with Visible Effects	10
Poison	15
Spell with no Visible Effects	20
per day since the creature’s death	+5

From Complete Adventurer's alternate use for Heal skill.