TV Schedule for Oxygen (KPTV4) Portland, OR

Unknown Serial Killers of America Carl Watts

Chilling confessions from a vicious slasher detail only some of his 100+ victims; when he's set to be the first serial killer ever released from prison, an eyewitness from decades prior could force justice on the man who vows to kill again.

Unknown Serial Killers of America William Suff

In the '90s, aderanged killer stalks sex workers in Riverside, Calif., claiming the lives of 13 women; when a would-be victim describes the perp to police, the race is on to catch the murderous john before he strikes again.

Unknown Serial Killers of America Daniel Conahan

Five corpses are found on the Florida hog trails; the investigation stalls until two men narrowly escape the perp's clutches; years later, eight more bodies are found in nearby woods, leaving police to wonder if it's the same evil killer.

Unknown Serial Killers of America Terry Rasmussen

Multiple unidentified bodies are found inside barrels in a New Hampshire forest; decades later, a murder 3,000 miles away reveals their connection to a serial predator who targets women and children, and changes his identity after every violent kill.

Snapped Annette Cahill

The deadly beating of a young man in West Liberty, Iowa, sits unsolved for 25 years, until cold case detectives are approached by an unexpected witness.