TV Guide Investigation Discovery Tuesday

A long-time resident of a suburban street descends into a morass of delusion, anger and paranoia that turns him against innocent neighbors.

In Colorado, a driver opens fire and sparks a high-speed pursuit that ends with a dramatic standoff; in Ohio, a man ignites a fierce gun battle with police.

In the early morning hours at a warehouse music venue in Texas, someone shoots a man who later succumbs to his wounds; police find a chaotic crime scene.

An argument over an old fence separates neighbors and the dispute escalates from repeated screaming matches and threats to physical fighting and vandalism.

A young woman calls 911 because her boyfriend is missing and there is a pool of blood in their apartment, and the evidence leads to the couple's roommate.

A longtime nurse confesses to helping end the lives of numerous elderly patients at multiple nursing homes, and behind her persona lies a ruthless psychopath.

Investigators search a farm for a missing man and find human leg bone on the property and the owner admits that her pigs ate her tenant alive.

The "Tourniquet Killer" terrorizes Houston girls, and when advances in DNA finally lead to his arrest, this psychopath eagerly confesses to multiple murders.

A student calls 911 to say she just shot her boyfriend, a 29-year-old attorney, in self-defense and the police soon discover that her story doesn't add up.

Once a wife goes missing, her husband becomes the prime suspect when police discover his checkered past but lacking a body or evidence of foul play.

On the surface, Judy Buenoano seemed like she lived a charmed life, but the facade of success fades away to reveal a trail of tragedy.

Over 10 years, Judy Buenoano survived two house fires, a mysterious canoe accident in 1980 and lost a husband in 1971, a child in 1980 and a boyfriend in 1983.

After 23-year-old Taunja Bennett leaves home on January 21, 1990, she doesn't return, and then her body was found in the Columbia River Gorge.

After multiple female bodies are found in the Pacific Northwest and California, someone starts sending letters to the police signed with a happy face.

In 1994, a serial killer hunts elderly women in a California town, terrifying the community, but a family member realizes the murderer is her own stepdaughter.

In 1994, a serial killer hunts elderly women in a California town, terrifying the community, but a family member realizes the murderer is her own stepdaughter.

Growing up, Ashley becomes troubled and violent, and her father and sister no longer recognize her, but then she murders her own grandmother.

Amy's worried about her brother, Joel's, behavior, and his girlfriend, Melanie, suffers abuse, but they both discover their worst fears have come true.

Michelle looks up to her father, but over time, fear and disgust replaces respect, but her world changes forever as horrific revelations finally emerge.

Audrey's brother craves negative attention and as he grows up, he becomes withdrawn and obsessed with the macabre and his family worries about Jake's darkness.

Katie's grandfather Buster had a dark past and he turned out to not be the man that Katie thought she knew and soon learns the hard truth.

When Lisa meets Corey, she falls in love with him, but then she barely survives when he brutally attacks her, but the next woman doesn't

A mother's love is the most powerful in the world, for one Ohio woman, it will even overpower her fear of death; incapable of throwing out her dangerous son.

A shooter guns down a soldier at home, but behind the tragedy lies a family torn apart by sex, manipulation and secrecy.

For a year, NYPD follows a bloody trail of murder attempts against a real estate entrepreneur, only to discover that no one is who they seem.

After the torture and murder of a woman in her home, her ex-husband calls 911; a man turns up dead in a house fire and his wife tells police he was suicidal.

A shooter guns down a soldier at home, but behind the tragedy lies a family torn apart by sex, manipulation and secrecy.

For a year, NYPD follows a bloody trail of murder attempts against a real estate entrepreneur, only to discover that no one is who they seem.

After the torture and murder of a woman in her home, her ex-husband calls 911; a man turns up dead in a house fire and his wife tells police he was suicidal.

A mother's love is the most powerful in the world, for one Ohio woman, it will even overpower her fear of death; incapable of throwing out her dangerous son.

After a retired accountant turns to an online dating service and meets a 69-year-old woman online, he soon encounters a series of mysterious illnesses.

15-year-old Audrie Pott was driven over the edge after lewd photos of her taken at a house party began circulating through text messages and on social media.