A man calls 911 when he finds blood inside a friend’s home. Officers enter to find a beloved community activist shot dead. Detectives piece together clues to find a cold-blooded murderer.

After ranchers spot the body of a brutally beaten teenage girl on a riverbank, deputies conduct countless interviews but to no avail; finally, cutting-edge technology helps police lift DNA from the murder weapon and zero in on the killer.

After motorists spot a man's body burning on the side of 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.

After a single father is found dead in his burning home, an autopsy reveals he was murdered; investigators must decode ballistic, chemical and digital clues to reveal a complex plan executed by a twisted killer.

Children find a missing woman's body in a rural community miles away from her home; forensic experts decipher surprising animal hair fibers and DNA evidence, which puts detectives on the trail of an enraged predator.

A car fire blazing near a beach sends detectives on a search that ends with the discovery of a murdered woman; the killer's attempt to eliminate evidence actually gives investigators the clues they need to catch him.

Detectives search for answers to the murder of a mother and her children.