In the summer of 2000, bags full of body parts start appearing all over the San Francisco Bay Area; investigators follow the trail of grisly clues to a secret cult carrying out a sinister scheme.

On a Mississippi back road, a 19-year-old woman is set on fire and left to burn alive; her last words lead detectives down a road of dead ends and the case goes cold until a special agent taps into her location data and finds a suspect.

In 1992, a 19-year-old woman is brutally assaulted outside of Desert Hot Springs, Calif.; miraculously, she escapes but lives in constant fear that her assailant will find her again one day, not realizing she has survived a serial killer.

A 12-year-old girl goes missing on her way to school in Oregon City, Ore.; the police investigation offers little in the way of leads, then a second girl disappears.

In 1981, a woman and three teenagers are murdered in a cabin in the remote town of Keddie, Calif., and no one is ever brought to justice; now, new evidence may hold the key to finally cracking this case.

A premiere fishing boat explodes into flames just off shore, stunning the small fishing town of Craig, Alaska; after fighting the flames, state troopers discover the remains of a young family and few clues as to could have set the ship blaze.

When a young family vanishes from their Southern California dream home, friends and family are left with dozens of unanswered questions; authorities suspect they fled the country, until an unlikely source uncovers the truth.

Gallaudet University is the premier college for the deaf in the United States, but this haven of higher learning is turned upside down after two students are murdered in their dormitory rooms.

A celebratory night turns deadly for the Whitaker family as they are gunned down at home; when investigators uncover a conspiracy, it will test one man's ability to forgive as he fights to save the criminal mastermind from the death penalty.

The morning of his anniversary, Mike Williams goes duck hunting; when he fails to return home, an all-out search commences, but it's only the beginning of a sordid mystery that will take close to 20 years to solve.

When an 11-year-old Arizona girl vanishes while waiting for an ice cream truck, it's clear she's been abducted; the search for her leads to a trail of suspects, making it the largest missing child investigation in Arizona history.

In 1984, the body of a 14-year-old girl turns up on the beach in San Diego and police think it relates to the murder of another teen; a clue yields an unbelievable suspect.

In 1980, Tim Hack and Kelly Drew go missing from a small Wisconsin town, then their bodies are found in a field; a woman comes forward nearly 40 years later to help solve the so-called "Sweetheart Murders" of Hack and Drew.

Shock sweeps through a Washington community when a suburban mother gets arrested for a murder from a decade earlier in Alaska; details of a seedy and sordid past emerge.

In 1998, a gifted Philadelphia graduate student is found murdered in her bed, triggering a hunt for her killer.

After a young couple goes missing, detectives find a clue leading them to a strange storage container in the middle of 95 acres, and what's inside unlocks the secrets of a monster hiding in plain sight.

In the 1970s, a serial rapist is on the loose in northern California; then, as his reign of terror over the community wanes, police discover he isn't just a serial rapist, he's a serial murderer, and he's been killing people all over California.

After a fire chief's wife's burned body is discovered, an autopsy reveals she died from a gunshot wound to the head, and the arson investigation turns into a hunt for her killer.

Sherri Rasmussen and John Ruetten are enjoying newlywed life until one morning when Sherri calls into work sick; that night, John returns home to find his wife murdered; years later, detectives discover Sherri's killer was too close for comfort.

In Florida, friends and family are stunned after an esteemed criminal law professor is executed in his garage; investigators follow a series of leads taking them on a statewide hunt in search of the murderous masterminds.

Over the span of decades, three women meet their deaths or go missing under mysterious circumstances, forcing authorities to examine the one thing they had in common -- they all fell in love with the same man.

"Betrayed" reveals chilling stories of chasing the American dream and how the veneer can dramatically crumble, ending in murder at the hands of a trusted family member, co-worker, lover, or friend. The cases of deception are told through the lens of the fictionalized, first-person perspectives of the victims. As investigators, family, and friends peel back the layers and facts of each case, the otherworldly narrator already knows where the trail ends. The narrator guides viewers through various relationships, raising suspicions about who will commit the ultimate betrayal.

From the moment a homicide is reported, a file is assembled to document every facet of the investigation -- crime scene photos, notes and observations, forensic reports, witness interviews, suspect profiles -- and continues to grow with new information until an arrest is made and conviction attained. Investigation Discovery opens these "murder books" to tell haunting tales buried within the pages. Hourlong episodes take viewers back in time with details of decades-old cold cases using actual archival footage, crime-scene evidence and first-person interviews with lead investigators, unraveling the mystery and uncovering what broke the cases open.

"Accident, Murder, or Suicide" investigates the deaths that are just a little bit too mysterious. It explores the unbelievable true stories in this hourlong program. Each episode retraces the investigation from the start to the end. Investigators take viewers through the twists, turns, and unexpected surprises as they dissect the red flags, show evidence, and point out the strange behavior that puts everything into question.