Texas police suspect a killer is on the loose when the bodies of four women are discovered by the side of a highway.

Ashley and her mother Kristine are meeting to co-sign a lease for an apartment, but alarms are raised when Ashley never shows.

Nikki Sue Entzel dials 911 to report a fire at her home, but the supposed accidental house fire turns into a murder investigation.

When Kemia Hassel calls 911 cradling her dying husband, detectives have no idea that they'll soon unravel a sinister murder-for-hire plot.

Letecia Stauch reported that her 11-year-old stepson hadn't come home, but what followed was a trial of deceit, secrets and murder.

Gretchen Anthony's family grow suspicious when they receive odd texts from her phone, before things take an incredibly sinister turn.

Festival goers dressed as zombies got a real fright when shots started ringing out in the crowd.

Dozens of rich older women seemed to die peacefully in their sleep, until detectives realised it was the work of a serial killer.

A husband calls emergency services to report that his wife has shot herself, but secretly recorded tapes uncover a different story.

After hosting a barbecue, two people were shot dead in their driveway - but the identity of the killer was even more shocking.