Killer at the Crime Scene - Season 4

Just streets away from the neon lights and fairground rides of Blackpool, police rush to the scene of a fire in an alleyway and make a grim discovery; the burning body of a teenage girl.

She's identified through DNA as missing 16-year-old Sasha Marsden, the brutality of her murder shocks even hardened detectives. Sasha hasn't been seen since being dropped off in the city centre for a new cleaning job at a hotel, but after finding sinister social media messages police discover things aren't what they seem, they're convinced she has fallen prey to a dangerous predator that if not stopped, will strike again.

The killer thinks he can outsmart the police, but forensic experts uncover a trail of hidden evidence to give detectives the advantage.

A father and son are found murdered in South Carolina, shot at point-blank range. DNA found at the crime scene leads investigators to uncover a deadly plot driven by greed. 

When a 72-year-old woman is found dead in her bed, police find DNA evidence linking a suspect. With no confirmed cause of death, they turn to advanced forensics to uncover the truth. 

When 82-year-old Mohammed Saleem is fatally stabbed in Birmingham and a series of explosions targets mosques in the West Midlands, counter terrorism uncovers a hate-fueled campaign. 

Examining the death of 17-year-old Connor Lyons, whose body was discovered next to a riverbank in Hull by a dog walker. With no obvious injuries, investigators questioned whether this was the result of a tragic accident, suicide, or something more sinister. Detectives were left searching for answers until a social media post led them to suspect foul play.

In a Silicon Valley home invasion, millionaire Raveesh Kumra is murdered. No forced entry leads investigators to suspect an inside job.

Investigating the death of spa owner Ildiko Krajnyak, who was killed in a explosion at her beauty spa in Orange County, California. Forensic experts meticulously combed through the wreckage, uncovering remnants of a parcel bomb. As investigators race to determined whether Ildiko was the intended target, forensic experts reconstructed the bomb to unmask the killer.

The murder of Karla Godoy, who vanished after going on holiday to Peru. As detectives scrambled to uncover the truth, a shocking confession led to an international manhunt for her suspected killer. As the net tightened, they hit a major setback - UK police had no jurisdiction to arrest him. Police turned to a landmark piece of domestic abuse legislation and traveled 12 thousand miles to gather crucial forensic evidence.

Examining the death of renowned neuroscientist Autumn Klein, who was rushed to the hospital where she worked after collapsing in her kitchen. She was believed to have suffered from a stroke and died several days later. When doctors found no medical explanation for her sudden demise, her colleagues at the hospital became determined to find answers. Unusually bright red blood samples led to the shocking discovery that this was a murder.

In North London, 22-year-old Imani is fatally shot near a playground in a targeted attack. As his family mourns, police uncover a web of gang feuds, revenge, and mistaken identity.