TV Guide Investigation Discovery Sunday

When 20-year-old student Cathy Torrez is discovered dead in the trunk of her own car in 1994, her family won't rest until her killer is found.

A college woman re-enters the lives of two best friends over the Thanksgiving break and the result is pure chaos and death.

When Michael & Rebecca Hargon vanish from their home along with their young son, investigators discover that Michael has recently come into an inheritance.

A family's lifestyle, which revolves around supporting one another, encounters tragedy when a family member's selfish desires turns deadly.

A family in Michigan thrives on winning, but when tragedy strikes after one competition intensifies, the small town encounters multiple cases of evil events.

A serial killer makes outrageous 911 calls to confess his crimes and later becomes known as the "Weepy Voiced Killer" due to his strange and whiny voice.

When a woman calls 911 and says that intruders have broken into her home and attacked her husband, police arrive and find the husband dead and the killers gone.

After a woman finds her husband unconscious and bleeding, police find clues during a 911 call that reveals a deadly plot to kill a father.

Elisabeth & Frank reconnect after years apart, but as their toxic relationship blows up, it results in a fire, leaving one dead and the other sits behind bars.

At night, Lorenzo Gilyard was a monster who preyed on women; cameras go inside the prison to get answers from the notorious serial killer.

Jenn learns to live with a monster, her big brother, Jimmy, who's cold, cruel and violent, and preys on his own family, mainly on his mother, Mary.

A dismembered torso turns up in a Florida forest, and the discovery launches a search for answers across the U.S., with only a tattoo found on the victim.

Police examine surveillance footage to learn about Orlando Euell's last moments, including witnessing him get into the car that would take him to his death.

Dawn Sandoval is discovered missing when her youngest sons return from school, but what appears to be a typical missing person case soon becomes a battle.

Lima, Ohio, police race to a chaotic scene at an after-hours nightclub following a shooting that leaves one person dead and multiple others injured.

A woman dies in a stabbing at home and police locate the prime suspect, her ex-boyfriend Antoine Bynum, and in his interrogation, he has a psychotic episode.

A killer shoots a young woman dead in her boyfriend's apartment and he turns up in a hospital bed 500 miles away with a gunshot wound and a bizarre story.

A Colorado woman is missing, and her roommate claims she'll help find her; the outbursts of a killer may be real, and some believe his rage is just an act.

Police respond to a 911 call to find a father of two dead in his home with more than 15 gunshot wounds, and police question the family.

Behind a church lies a burned and dismembered body and investigators identify the victim by fingerprints and receive a tip the suspect is female.

A 33-year-old oil rig worker calls 911 to report his girlfriend missing and he seems to be helping in the time-critical hunt to find her.

A 19-year-old woman vanishes and the suspect is a former high school classmate with whom she was communicating days earlier and has a notorious past.

A small-town marriage ends in tragedy when a man who uses a wheelchair discovers his loving wife of ten years wants to end their marriage.

Ed Kemper appears to be a gentle giant who offers rides to young female hitchhikers, but behind his charming smile lurks a perverted monster.

After killing his grandparents, 15-year-old Ed Kemper is sent to a mental institution, there he uses his high IQ to deceive psychiatrists, but he's released.

Ed Kemper fears arrest and decides that he must finally deal with his mother, bringing the story to a devastating finale, and he reveals his secrets on tape.

Ed Kemper appears to be a gentle giant who offers rides to young female hitchhikers, but behind his charming smile lurks a perverted monster.

After killing his grandparents, 15-year-old Ed Kemper is sent to a mental institution, there he uses his high IQ to deceive psychiatrists, but he's released.

Ed Kemper fears arrest and decides that he must finally deal with his mother, bringing the story to a devastating finale, and he reveals his secrets on tape.

A small-town marriage ends in tragedy when a man who uses a wheelchair discovers his loving wife of ten years wants to end their marriage.

The abduction of a young mother from a crowded hospital parking lot is the beginning of a terrifying mystery that will torment her loved ones for decades.

After a teenager mysteriously disappears, police must determine if a secret meeting with a young man led to her murder.