A patrol officer is shocked by the amount of blood at a traffic accident and is shocked by the coroner's ruling until an anonymous phone call re-ignites the case.
On Valentine's Day, an obstetrician finds his wife dead and calls 911; police discover inconsistencies between the blood spatter evidence and his version of events.
When police recover the submerged car of a missing man, they find no body; the investigation that follows uncovers a deadly obsession and the motive for murder.
Investigators piece together evidence found at the scene of a Native American woman's murder; the tire tracks and shoe impressions could lead them to the killer.
Woman disappears from grocery store parking lot in Boulder, Colo.; investigators find extraordinary clues in a pair of bloody gloves, unique tire tracks, and ordinary grass and pine needles.