Harold Shipman: A profile of one of the most prolific serial killers in history. With an estimated victim-count of 250, what drove his horrific crimes?

Robert Napper: Known to some as The Plumstead Ripper, he was convicted of two murders, but his victim count is actually estimated to be much higher.

A profile of serial killer Dale Cregan, who was sentenced to life in prison after the senseless murders of two men and two police officers in 2012.

The story of 21-year-old Anthony Arkwright from South Yorkshire, who in 1988 went on a killing spree in which he murdered three people - including his own grandfather.

A profile of the cold-blooded killer John Sweeney, nicknamed the Canal Killer due to the places he dumped the body parts of his victims.

A look at the crimes of Andrzej Kunowski, a man so vicious he was nicknamed the Beast after raping and murdering a 12-year-old girl in 1997.

The story of Hartlepool man Arthur Hutchinson, who achieved notoriety in 1984 when he broke into a Sheffield home and took the lives of three family members in a senseless killing.

Peter Moore, the killer dubbed 'The Man In Black', a murderer who took the lives of four innocent men for fun.

A profile of the double-killer who branded himself the 'Angel of Mercy', after murdering two of his neighbours in cold blood.

A profile of the man who murdered his wife, two children and two dogs on one terrifying day.

A profile of the killer who, after killing 22-year-old Julie Hogg, became the first person to be convicted under revised UK double-jeopardy laws.

A look at the man convicted of sexually assaulting and murdering two nine-year-old girls from Brighton in 1986.

A look at the twisted killer who tortured and murdered a man in his home, filming the whole ordeal before torching the flat to cover his tracks.

The horrifying story of a woman who murdered her own sister in a brutal attack, after developing a deadly obsession with her brother-in-law.

A profile of the double-murderer who killed a 77-year-old teacher and 59-year-old reverend in two frenzied attacks

The life and crimes of Victor Farrant, who, upon being released from prison for rape and GBH, struck again - only this time his victim did not survive

The crimes of Colin Pitchfork, who took the lives of two 15-year-old girls and became the first person to be convicted of murder based on DNA fingerprinting evidence.

The shocking story of Kenneth Regan and William Horncy, the men who murdered a millionaire and three generations of his family in a vicious, greed-fuelled attack.

The story of Ali Qazimaj, the double murderer who was found guilty of the brutal assassination of an elderly couple.

The story of Stuart Campbell, who was convicted of the murder of his 15-year-old niece in 2002, even though her body has never been found.

The story of Trimaan Harry Dhillon, who attacked his ex-girlfriend in a jealous frenzy and committed a brutal murder after a campaign of harassment.

The story of Jamie Reynolds, the 23-year-old killer who murdered 17-year-old former head girl Georgia Williams in 2013.

British killer Daniel Gonzalez, also known as the Freddy Krueger Killer, who took four lives during a chilling two-day murder spree in 2004 after being inspired by horror films. He eventually commited suicide in his room in Broadmoor Hospital.

A family's worst nightmare occurs when 16-year-old Becky Watts goes missing, and is found dead days later, murdered by her own stepbrother.

The crimes of John Cannan, a dangerous sexual predator who murdered one young woman just days after his release from prison, and is suspected of many others.