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After a gunfight outside a bar ends with two dead, Grand Rapids detectives discover that twin brothers are involved.

Convicted murderer John Cannan is the prime suspect in the disappearance of estate agent Suzy Lamplugh. Experts examine the crucial video evidence.

When a man is found bludgeoned to death outside an apartment building, his friends deny all knowledge of his murder. But detectives suspect at least one of them is lying.

When Mark Galante told police his wife Jody was missing, they noticed his lack of concern. Experts analyse the actions that marked him out as a killer.

When a 21-year-old mother doesn't return from night classes and her car is found burned, foul play is suspected. The web of lies that unfolds is shocking.

When a land developer finds his wife missing, the FBI suspects him of the kidnapping but they must keep their options open.

Scott rescues a dehydrated pit bull puppy that has been left, muzzled and chained, in the back of a hot car. Will its owners be allowed to redeem their dog.

In Colorado the mysterious abduction of a young mother ends up as a brutal homicide. With few clues and fewer suspects, the detectives go on the chase.

E.'s Casebook. When a killer's dumping ground is discovered in Florida, investigators must confirm the identity of charred bones in order to solve the brutal crime.

A lone officer tries to keep the peace as angry locals set upon an alleged paedophile. And, the cops hunt for a dangerous driver.

Officers are taken by surprise as a desperate drive makes an escape attempt by reversing in to a police car and a suspicious fire raises alarm bells for the bodycam squad.

Sandy Berfield is killed after suffering years of harassment from a co-worker and has him jailed for violating a restraining order. Released, he sends her a bomb.

A closer look at real FBI cases with dramatic re-enactments and interviews with agents and forensic scientists who work in the investigations.

When a little girl is abducted the FBI race to locate their prime suspect - a drifter on parole for kidnapping children - but will they find him before it's too late.

A seemingly charming and generous man targets vulnerable women for his brutal attacks, leading to a cross-country manhunt for the serial killer.

In 2013, 51-year-old Robin Pope's body was washed ashore just one mile from her ex-husband's home. Did she drown, or was this a malicious act by her ex.

In 2013, 22-year-old Amber Bass was shot dead in her own driveway after a night out. Was this just a random act of violence or was a jealous lover involved.

When Sharon Robinson's body is found outside New Orleans, her abusive corrupt police officer boyfriend is a suspect. But had she been involved in a bigger crime.

In 1996, beloved teacher Norma Luobikis was found stabbed to death in her home. Evidence suggests an intimate bond between the victim and her killer.

In 2010, Amber Jackson disappeared from her Kauai home, only to be found brutally murdered days later. Was it the act of a temperamental lover or a stranger.

In 2015 Devan Schmidt's body is found half-naked and bruised in her home. The toxicology report suggests an overdose, but was it foul play at the hands of a new love.

Anthony Shore is a predator who stalks and strangles his victims. For years, he eludes investigators until an unrelated assault presents a lead.

A young man knew his father was a monster and a killer, but to this day, he doesn't know the scope of his father's horrendous crimes.