I AM A KILLER Season 4

A murderer recounts the crime that ended one life and ruined his own. Those affected, including a police officer and the victim's family, also speak.

In prison for killing her husband, a woman details her past abuse and her turbulent marriage. Her mother also reflects on their strained relationship.

Years after leaving the military, Toby Gregory claims his service and PTSD caused him to murder his wife, Inez. But Inez's family believes otherwise.

Enraged over his rebellious daughter's choice in men, an extremist father enlists his son in a terrifying plot of intimidation and murder.

Sentenced to life without parole for Jason Johnson's horrific murder, Gary Black says he has no regrets, while Jason's family finds purpose in tragedy.

After fatally shooting a coworker, Thomas "TJ" Schiffens maintains his innocence. But details surrounding the crime suggest TJ had a motive.