TV Guide Investigation Discovery Tuesday

Questions and accusations fly after savvy entrepreneur and mother of five, 52-year-old Dee Warner, vanishes from her rural Michigan home.

Beth Karas takes a deep dive into real-life scandals, exposing bizarre secrets, shattered lives and twisted motives, uncovering deceit, greed and manipulation.

A teenager becomes an inspiring mental health advocate online and changes lives, but she soon meets young men who're primed to threaten, harm and attack.

A deadly fire in a small Illinois town raises questions as to whether it was a tragic accident or murder and the ensuing investigation uncovers a web of lies.

A professor at Tufts University School of Medicine in Boston meets a prostitute in a red-light district, but an obsession ultimately leads to a vicious murder.

As investigators delve into the personal life of Maj. David Shannon, who was shot in his home, they reveal sordid secrets that could have led to his murder.

The investigation of a tragic murder leads to long hidden family secrets, as detectives uncover a man living a double life.

A woman falls head over heels and marries a charming man, but she gets more than she bargained for when she is confronted with the harsh reality.

A man is gunned down on a deserted road in Arkansas, as the case goes cold, the deceased man's daughter tries to track down the perpetrators of his murder.

21-year-old Latrese Curtis is found stabbed to death on the side of a highway, and detectives uncover that she lived a double life, and unrequited love emerges.

19-year-old Francine Stepp discovers her parents Mark and Dee murdered in their home in Stillwater, Okla., and detectives uncover a scandalous secret.

Trucker Albert Thomas is shot dead in his truck, and detectives are left with few clues to capture his killer, and a web of lies is unraveled.

In February 2008, Ben Oxley is shot in the head at point-blank range while sleeping in bed, and his wife becomes the focus of the police investigation.

When a home invasion leaves Bill Ross murdered in his sleep, detectives in Shelbyville, Tenn., scramble to uncover the identity of a pair of masked men.

In Palm Beach, Fla., detectives discover a pregnant mother of 3 murdered in her sleep, and they delve into her extensive use of social media.

Deborah Williamson meets her stepson, David Shafer, and knows there is something unsettling about him, but her warnings about his behavior go unheeded.

When Steven Crittenden confesses to his brother, Bryant, and then swears him to secrecy, Bryant faces the toughest decision of his life.

When Vernon Jensen's ex-wife proves how far she'll go to get him back, his family is fractured beyond repair, now Jade wants answers only Vernon can provide.

Lori and Brook have one thing in common, Gary Simmons; the 2 women meet for the first time and discover they're connected in terrifying & surprising ways.

Lori and Brook have one thing in common, Gary Simmons; the 2 women meet for the first time and discover they're connected in terrifying & surprising ways.

Eline starts dating Matthew and has a son with him, but he's a man who was violent and full of rage, and when she leaves him, Matthew's fury explodes.

Lisa and Kevin Knoefel's selfless act ends in a shocking murder at the hands of the troubled teen, who is a pawn in a twisted plot.

After 4 women vanish, fear grips Texan communities, and desperate families seek answers; Texas Ranger Jim Holland launches a high-stakes interrogation.

Lisa and Kevin Knoefel's selfless act ends in a shocking murder at the hands of the troubled teen, who is a pawn in a twisted plot.

After 4 women vanish, fear grips Texan communities, and desperate families seek answers; Texas Ranger Jim Holland launches a high-stakes interrogation.

Eline starts dating Matthew and has a son with him, but he's a man who was violent and full of rage, and when she leaves him, Matthew's fury explodes.

After 13-year-old Carrie Ann Jopek vanished into thin air in 1982, her body is soon found underneath a neighbor's porch, which sets off a hunt for her killer.

When 5-year-old Samantha Runnion is kidnapped by a man and dragged into his car in the Summer of 2002, the race is on to find her and the man responsible.