Season 4

Dudley, UK-Nathan was obsessed with horror films, and lured Julia Rawson, 42, from a pub to his flat, where he and his partner David killed her. Her dismembered body was put into a canal and on wasteland.

Essex, UK-Stephen, a serial rapist and serial killer, would use GHB to drug his gay dates, kill them, and dump their bodies close to his flat. Known as the 'Grindr Killer', he murdered 4 men before his capture.

Hull, UK-Pawel was a serial sex offender, who walked around late at night in the dark looking for a victim. Unfortunately, Libby Squire was in his sights. He drove her to a quiet field, assaulted her and left her body in the cold river.

Hull, UK-Mark had PTSD, anxiety and depression, he had multiple issues affecting his mental well-being. Sometimes, his neighbor Vera would blast loud music. When she knocked on his door when she forgot her keys, he snapped and killed her.

Ipswich, UK-5 prostitutes are murdered in saunas and massage parlors in the east coast of England. It is also highly possible that he was responsible for the murders of prostitutes in the red light district in Norfolk, where he ran a pub.

Solihull, UK-Raneem, 22, left her abusive husband after discovering he had a wife and children in Afghanistan. Janbaz stalked and harassed Raneem, and slept outside her home. In a rage, he stabbed her and her mother, Kaohla to death.

Poole, UK-19 year old, Elliot, murders his 17 year old girlfriend Emily and involves his parents in the cover up. Elliot was spoiled, had high opinions of himself, and immature with a jealous streak with the few girlfriends that he had.

Banbury, UK-Ben was a nurse, and an 'angel of death'. He would inject patients to cause heart attacks, and try and revive them for the thrill. He killed 2 people and harmed 15 others.

Warrington, UK-Iftikar and Farzana murdered their daughter Shafilea, after years of abuse. They suffocated her, and dumped her in a river. Her father thought her opinions and dress sense were too 'western', causing dishonor to traditions.

Yorkshire and Birmingham, UK-Michael kidnapped teenage prostitute, Julie Dart, blindfolded her, put her in a box, made her write a ransom note, then killed her. The next year, he kidnapped and raped Stephanie Slater, but let her go.

Sussex, UK-Ian and Kayleigh have had an on-off toxic relationship for 2 years and one night, he strangles her in what he claims is self defense, while their baby daughter is sleeping in the room.