A sadist blames his girlfriend's murder on a friend, but after a visit from his aunt, he spills the terrible truth. Two kids are dead, and the killer refuses to talk to police.

A missing man's half-eaten remains turn up in a pig pen, and the owner claims she shot him in a mercy killing, but there's another dark secret buried on her land. A woman fiercely denies her part in a murder, but her boyfriend knows the truth.

Teens break into a sleeping woman's home and mercilessly kill her and maim her daughter with a machete. As they coldly recount the night, police realize they are dealing with sociopaths. Two teens devise a devious plot to kill a girl in cold blood.

A husband cannot tolerate his in-laws staying with him and decides to remove them and his wife permanently. A killer admits his victim was no friend of his after first telling police the man was his best pal.

A disgruntled man decides that killing someone will make him feel better, so he chooses a random stranger and uses nine rounds to ruin two families' lives. Next, an egotistical kid attempts to persuade investigators that he beat a senior citizen to death in self-defense.

A serial sniper, desperate for fame, ramps up his murders when the press doesn't give him the attention he feels he deserves. An antisocial teen wipes out his family, including the dog. He claims to have no feelings about the callous murders.

Every parent's worst nightmare is the possibility that their child has the same evil traits as the most heinous murderers. In this episode, specialists look at the early warning indicators in psychopathic killers arrested as teenagers and young adults.

When a 64-year-old grandmother does not return home from her morning walk, local police uncover that the man responsible for her disappearance is not only a pathological liar but a sexually deviant psychopath carrying out a twisted fantasy.

Six months pregnant Martine Bernard's family reports her missing, days later, her father vanishes as well. When officers interview Martine's husband, Cassandritz Blanc, they find a calculating psychopath willing to do anything to cover his tracks.

A 33-year-old oil rig worker calls 911 to report his girlfriend missing. He seems to be helping in the time-critical hunt to find her. A failed polygraph test leads detectives to suspect this seemingly caring boyfriend is a psychopath.

Hikers in Portland discover the badly decomposed body of a raped and strangled young girl. A month later, another woman turns up brutally murdered in same fashion. The prime suspect is a homeless drifter harboring dark sexual fantasies.

After meeting with her divorce attorney and estranged husband, a devoted mother of three vanishes into air. As friends and family desperately try to locate her, the husband instead plays a psychopathic game of cat and mouse with investigators.

A man finds his family slaughtered in their West Virginia home. The oldest son, 16-year-old Gavin Smith, is missing, he turns up hiding at his girlfriend's.

A 19-year-old woman vanishes, and the suspect is a former high school classmate with whom she had been communicating days earlier. The family is weary, for the suspect has a notorious past filled with sexual deviancy and homicidal urges toward women.

Weeks after an 18-year-old man's friend reports him missing, his clothing turns up burned in a trash can behind a suburban home. When witnesses lead investigators to a young man with a history of violence, they soon learn he had not worked alone.

On a quiet winter night, a mother finds her 22-year-old son horrifically dismembered in her basement. The lone suspect is the victim's ex-girlfriend, who is at her home in an emotionless state with blood on her hands.