Chief Evidence - S7.E17

The 1996 Seattle murder of suburban couple Raquel Rivera and Jay Johnson is detailed. Investigators first believe the slayings were the result of a drug deal gone bad. However, no drugs are found in the house and the victims' blood isn't present on the clothing of the suspects. Evidence from the couple's dog Chief, who was also killed, eventually ties one of the murderers to the scene. This is one of the first cases where dog DNA was used to convict.