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Why does anyone commit murder? Sometimes the answer is easy to figure out - a jealous spouse, an angry co-worker. But in a lot of cases, the reasons aren't so clear-cut. These are the murders that don't make sense at first. The ones that can see pointless or even random.

This show takes a look at some cases that are the result of passions and reasons that aren't apparent at first glance. Each episode reenacts a crime and uses original interviews with family members and law enforcement to unveil the real causes behind some truly horrific crimes. The show also gives the survivors an opportunity to tell the world a little bit about the victim's life.

Motives & Murders: Cracking the Case is a Crime, Drama, Kids & Family, Mystery series that is currently running and has 6 seasons (57 episodes). The series first aired on October 30, 2012. It has moderate reviews from critics and viewers, who have given it an IMDb score of 6.9.

Motives & Murders: Cracking the Case is available for streaming on the Investigation Discovery website, both individual episodes and full seasons. You can also watch Motives & Murders: Cracking the Case on demand at Investigation Discovery Amazon Prime, Amazon, Hulu, Google Play, iTunes, Investigation Discovery online.

Tuesday 10:00 PM et/pt on Investigation Discovery
6 Seasons, 57 Episodes
October 30, 2012
Crime, Drama, Kids & Family, Mystery
6.9/10
Cast: Perry Norton
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Motives & Murders: Cracking the Case Full Episode Guide

  • The mutilated body of 17-year-old Lori Billingsley is found in a ditch on the outskirts of town, pointing to a sadistic killer on the loose in Oregon, but Billingsley's case goes cold, and it's up to her sister to pursue justice.

  • In southern Louisiana, a task force forms to hunt for a serial killer following a series of deadly home invasions.

  • A New Hampshire man is shot dead through his screen door; investigators are stumped until they uncover a seething grudge and a culprit closer to home than anyone could have imagined.

  • A high school senior is murdered in her family's Minnesota farmhouse, but the case soon goes cold; years later, a fresh set of eyes spots an overlooked clue, but cold case detectives will need more to convict the killer.

  • After a respected widow is beaten to death in her Salt Lake City home, investigators suspect she knew her killer, but it will take 20 years before a set of children's fingerprints can put him at the scene of the crime.

  • When 18-year-old Lisa Monza is murdered in San Lorenzo, California, investigators look for a connection to other unsolved murders in the area. But it will take several years and help from an unlikely source before they can track down her killer.

  • When the naked blood-soaked body of a young woman is found on the floor of her Orlando apartment, it's up to investigators to find her killer before he strikes again.

  • On a September morning in 1973, Debra Dill's bludgeoned body is found next to her car in rural Maine. Her grieving community wakes up to a nightmare, but it will take nearly twenty years before the killer is behind bars.

  • Kimberly Dunkin's body is discovered with a single gunshot to the head, and though investigators have a feeling she was the victim of a gang war, it will take 15 years before her case is solved.

  • While building their seaside dream home in Connecticut, Matthew Monahon discovers his pregnant wife Kelsey hogtied on the floor and clinging to life. And when she dies days later, a $300,000 life insurance policy casts him as the number one suspect.

  • A woman's body is dumped in an Orlando park. And as detectives connect the dots, a spate of seemingly random beatings, carjackings, and murders soon tells the story of a one-man crime spree.

  • A devout Mormon and popular University student, 19-year-old Brooke Wilberger is taken from an Oregon parking lot in broad daylight. Police immediately launch a massive search and the story captures the nation's headlines.

  • A well-liked schoolteacher Marilyn Habian is shot in the heart in the basement of her Cleveland-area home. After the case goes cold, news of a potential prison confession leads investigators back to her front door.

  • On her last day as a high school freshman, a 14-year-old girl is brutally beaten and set on fire. The horrifying crime sends shockwaves through her California community and with a possible serial killer on the loose, investigators hunt for a monster.

  • In Cleveland, a 14-year-old African-American girl is snatched off the street, assaulted and murdered on her way to school. Initially, detectives work the case 24/7. But it will take a lucky break and nearly 30 years before the culprit is behind bars.

  • When a pregnant 23-year-old Iowa woman is shot in her own bed, investigators must quickly determine if they are looking for someone with a deadly grudge against the couple or a more sinister culprit closer to home.