Quest Red

It's touch and go for German shepherd Zeus as the Animal Cops medical team work through the night to remove a collar embedded in his neck.

No matter how clean a crime scene appears to be, the culprit often leaves something behind. Even a fingerprint or shoe tread can lead to a conviction.

Hiding a body can be tricky - it's sometimes easier to obscure the circumstances of death, turning murder into suicide or blaming it on someone else.

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

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

In 1998, Bachan Kaur Athwal ordered her daughter-in-law to be strangled to death in an 'honour killing'. The victim's family reveal how her murder affected them.

When an employee at an armoured van company receives a call about a money shipment that did not arrive, an FBI search for the missing van begins.

Shannon Sanderson was abducted after a successful night at the casino and police discovered she had been stalked and attacked for her $5,000 winnings.

Follows the FBI investigation into a robbery in which masked gunmen tied up employees at an armoured truck depot and left with $18.9 million.

A family is torn apart when a mother in Florida goes missing. The case stumps detectives, who believe that only the woman's three-year-old son knows the truth.

A landlord approaches his rental home to inspect a broken window when he hears a baby crying. What he finds inside will haunt two families forever.

In 2005, a woman is reported missing when she fails to show up at a Motley Crue concert. To this day, her friends and family wait for her killer to visit her secret grave.

In rural Missouri, the body of a young woman lies dead on a deserted dirt road only days before her wedding. Police uncover surprising secrets in her fiancé's life.

The brutal murders of two teenage girls at a remote lookout point at first seem random. Police uncover a web of secrets among their network of friends.

When Erika Verdecia goes missing, her family launches their own search for her. What their homegrown investigation uncovers is a tragic trail of bloodshed.

In Baytown, Texas, 37-year-old Crystal McDowell disappears without a trace. Can detectives uncover the mistake that gives her killer away.

A divorcée starts a relationship with a seemingly kind father. However, she doesn't see what everyone else sees in her new man - that he is a killer.

Eight-year-old Jamie Lavis was on the bus Darren Vickers was driving before he disappeared. Vickers joined the hunt and spoke on TV - but was hiding an awful truth.

When a young man with a developmental disability vanishes, his legal guardian frantically searches for him. Police turn to CCTV to find him.

Shana Grice was murdered after being stalked by her ex-boyfriend, Michael Lane. He denied involvement, but experts examine police videos to determine the truth.

The town of Cleveland, Oklahoma, is shocked when its esteemed Sheriff is shot dead. Law enforcement determines to find justice for their fellow officer.

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

A shocking machete attack on a puppy leaves the medical team fighting to save his life. The Animal Cops embark on the hunt for his attacker.

Contract killings arose out of the need to establish the perfect alibi, hiring someone can deflect guilt. Forensic science is changing this.

Mobile phones, CCTV and cashpoints can track virtually every human move. We see exactly how this aids murder investigations.

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

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

Barrister Robert Rinder examines the case of Rolandas Poskus, a man who was found dead in a park in Hull, and Amanda Playle, a woman who was stalked.

40-year-old Priscilla Strole seeks a fresh start when she and her teenage son move to a small town in California, unaware it will lead to her untimely end.

A Lost Soul. Lee disappeared one morning after leaving a friend. Had he gone into the wilds, or maybe joined the Israeli army? Follow the hunt for this troubled teen.

On Valentine's Day, Demetrius Graves is fatally stabbed. Two days later, Bonnie Ross turns up dead. Police learn they shared one fateful connection.

Thomas and Lisa Infante had four children and a volatile marriage. One day Lisa announced she'd met someone else and an argument spiralled out of control.

Rogelio Morales sweeps Margarita Sanchez Lemus off her feet. Behind Rogelio's winning smile lurks a monster who will soon show his true colours.

When Jeff Silvernail finds his partner dead at home, it appears a burglary gone wrong. But police soon uncover it is, in fact, the ultimate betrayal.

To solve the murder of a respected young entrepreneur, Detective Dale Mason must navigate a tangled conspiracy and outwit a band of career criminals.

Robert Rinder examines the case of 35-year-old Claudia Lawrence's disappearance. Plus, an unprovoked attack leaves a man fighting for his life.

In 2015, 33-year-old Jonathan Cherol is shot dead in his garden. CCTV footage sends detectives on the hunt for a strange woman and a mysterious vehicle.

Death At The Beach. On Christmas Day 2011, an aid worker was on holiday in Sri Lanka when he broke up an altercation in a hotel bar. His selfless act would end in murder.

When a young mum goes missing in Ellesmere Port, the whole community searches for her. After a tip, Police locate the charred suitcase that holds her remains.

In Texas, on Christmas Eve 2010, a 12-year-old boy vanishes. Police look at those closest to him, but only surveillance footage can reveal the truth.