In an affluent D.C. suburb, a successful luxury car salesman is gunned down execution-style in his bed. The arrayed evidence eventually lead investigators to Mississippi and back as they close in on an unlikely assassin with a chilling motive.

When the body of a devout Catholic divorcee is found in her smalltown Pennsylvania home, detectives must connect the dots between a silver van, a .32-caliber shell casing, and a bonanza of envelopes stuffed with cash.

A tightknit community is shattered when its school superintendent is gunned down at his upstate New York home. And law enforcement's big break comes when a panic-stricken caller claims to know who the killer is.

In Austin, Texas, a lone gunman kills 25-year-old professional cyclist Moriah (Mo) Wilson. And the execution-style murder tells investigators the hit was personal.

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When an attempted armed robbery ends in murder, UK detectives must connect the dots between hours of surveillance video, a size-five shoeprint, telltale bruises, and the remnants of a suspicious bonfire.

Police find 28-year-old Cathy Marlow slumped against the wall of her office bathroom. When they discover her purse and its contents mssing, along with six office laptops, detectives suspect it's a burglary gone bad.

Louisiana investigators find Andrew Jasmine in front of his home video game console, riddled with bullet holes. And with shell casings from two different firearms, the crime scene bears the hallmarks of a criminal conspiracy.

When social media influencer Sasha Samsudean is murdered in her Orlando, Florida apartment, detectives must sift through a mountain of evidence. And, of the 27 different shoeprints found at the crime scene, only one belongs to her killer

In the aftermath of an apartment fire, Missouri firefighters discover the body of 23-year-old single mom Melanie Breckle. It's clear she was the victim of a violent assault, and that her killer lit the fire to cover his tracks.

When a 36-year-old artist and mother of three disappears in Upstate New York, it's up to investigators to figure out what's hiding amidst an online gamer crush, a best friend's betrayal, and a timeline that just doesn't add up.

In Ottawa, a mother of three is stabbed to death in her suburban home. Solving the tragic homicide involves connecting cellphone records, a hidden camera, a fragment of a latex glove-and getting a DNA sample from a cold-blooded killer.