A man calls 911 when he finds blood inside a friend's home, and the officers enter to discover a beloved community activist shot dead. Detectives must piece together the clues to catch a cold-blooded murderer.

After hunters discover the dismembered body of a young woman, police uncover a shocking secret she has kept from her friends. Blood spatter and incriminating receipts help investigators decode her demise at the hands of a monster.

After ranchers spot the body of a teen girl brutally beaten on a riverbank, deputies conduct countless interviews to no avail. Years pass until cutting-edge technology helps police zero in on an enraged killer.

After spotting a man's body burning on the highway, investigators find evidence of a brutal assassination and fiery cover-up. Detectives decode construction debris with curious details to reveal a scheme that ended in murder.

When a beloved single dad is found dead in his burning home, an autopsy reveals the fire wasn't what killed the man. Investigators must decode ballistic, chemical and digital clues to reveal a complex plan by a twisted killer.

After a young woman goes missing, her disposed body is found in a rural community miles away. Forensic experts decipher surprising animal hair fibers and DNA evidence, which put detectives on the trail of an enraged predator.

A car fire blazing near a beach sends detectives on a search that ends with a young woman found dead, but the killer's attempt to eliminate evidence may actually give investigators the clues they need to catch him.

Shots fired at an apartment complex lead police to a horrific discovery: the bodies of a single mother and her two adult children. Detectives find answers in shell casings, shoe impressions and DNA to stop a diabolical predator.