Three women who advertised erotic services on Craiglist are assaulted, on of them is killed; surveillance video and witness reports match a man who no one would ever suspect to be a killer.

When government intern Chandra Levy goes missing, detectives discover she may have been having an affair with a senator; a man in jail claims he has information

When a deadly sniper terrorizes the DC area for weeks, frantic police put out an APB for a white van, but the FBI has a theory that there might be more than one sniper, and they're not driving a white van.

When a young man is brutally murdered in his home, the only suspect with a motive is his ex-girlfriend, who claims she hasn't seen the victim for months; detectives uncover evidence, and phone messages that tell a different story.

When an aspiring actress is found dead in the home of a legendary music producer, he claims it was suicide. But as detectives piece together the crime scene, study the pattern of blood splatter, and the position of the weapon, they zero in on their suspect and a history of bizarre behavior.

When three members of the same family die of mysterious causes, police being to suspect they have been poisoned. Detectives exhume bodies and confirm the presence of antifreeze, but who is the poisoner, and why? The secret almost dies when a fourth family member is poisoned, but survives.

A killer terrorizes Wichita, Kansas, preying on random people and families, tying them up, and strangling them. But then the killer goes quiet. When he resurfaces decades later, police find a way to lure him to reveal his identity - and it's a man no one suspected.

When a series of women are murdered in Baton Rouge, police draw a profile and begin DNA testing a segment of the city's population - white men. But when one victim survives, she tells detectives they're on the wrong trail. The killer isn't white.

When a newly married woman is killed at home, police believe it's a robbery gone wrong. But 20 years later, an LAPD officer opens the cold case file and sees the crime in a new way. The murder was staged to look like a robbery and the killer could actually be a cop - from the same department.

When four women are killed at different times in different states after going home from a bar with a handsome young man dressed like a cowboy, detectives don't realize the murders are linked together. When they do, their killer is on the run and the manhunt is on.

When a banker's soon-to-be ex-wife dies, it is passed off as an accidental fall, but after months of investigation it becomes clear that she was murdered.