Relentless Collection

Sam Dietz, a New York cop recently reassigned to Los Angeles, joins the hunt for a serial killer who seemingly picks his victims at random from the telephone directory - but the closer he gets to cracking the case, the more personal the stakes become.

Sam Dietz is a relentless cop who is trying to get over a serial killer's attack on his family in the last Relentless film. He is also trying to find the new killer in the city. Gregor is a relentless patriot who is trying to avenge the deaths of his family. He hunts down those responsible, and executes them one by one. The two men learn to understand and even respect each other in this violent tale of cat and mouse.

Sam Dietz, divorced Los Angeles detective, is now back (from "up North") agrees to consult on a serial killer case. Not wanting to be anymore involved than that changes when the killer forces him to become actively involved in the investigation. The killer is someone he's arrested before...

The fourth Relentless movie has Detective Sam Dietz (Leo Rossi) investigating a series of ritual murders committed by another L.A. serial killer. The only clue linking the victims is that all of them were in the services of a shady and unconventional therapist named Dr. Sara Lee Jaffee (Famke Janssen) who may know a lot more than what she is telling. Dietz and his new detective partner, Jessica Parreti (Colleen Coffey), think there is a link between Dr. Jaffee's therapy sessions and the murder victims when they learn that all of them had a near-death experience in the past. On the home front, the recently widowed Dietz struggles to raise his teenage son, Cory (Christopher Pettiet), on his own and deals with the troubled teenager slacking off in school, abusing drugs, and carousing with a local and similarly troubled teen girl.