Erskine, became known as the ‘Stockwell Strangler’ after he killed seven elderly men and women in their homes in south London between April and July in 1986.
During the investigation the victims were examined by Home Office pathologist Dr Iain West.
All had been strangled manually with the killer using just one hand.
When police finally captured 24-year-old Kenneth Erskine they found he was already on file as a cat burglar.
He was convicted at the Old Bailey in 1988 and sentenced to forty years.
In 2009, after new psychiatric evidence was heard at the Appeal Court, it was ruled that Erskine should have been convicted of manslaughter on grounds of diminished responsibility. He was subsequently moved to be detained indefinitely inside Broadmoor top-security hospital.
In 1993 Colin Ireland, a former soldier, decided to become a serial killer. He became known as the ‘Gay Slayer’.
He decided the ‘casual affair’ lifestyle of some members of London’s gay community made them ideal targets.
His first victim was theatre director Peter Walker.
After killing him at his London flat he called a newspaper and tipped them off.
Police found Mr Walker naked and tied to his bed with leather belts.
Chris Dunn was the second victim. Police found him naked and tied to his bed. He had been strangled.
Ireland then started making phone calls to Scotland Yard taunting them and challenging them to catch him.
When police found the body of third victim Perry Bradley – similarly tied up and throttled, they found the killer had turned family photographs on a mantelpiece towards the wall – so they would not see the murder.
When the police found victim four, Andrew Collier, tied and strangled at his London home they found the killer had also strangled his pet cat.
Ireland was caught and jailed for life after murdering Emmanuel Spiteri. He had picked up his victim at a London gay club, but as they walked through Charing Cross together they were caught on CCTV, and Ireland was identified.
Dennis Rader, known as the BTK murderer, killed 10 times in Sedgewick County, close to Wichita, Texas, between 1974 and 1991.
His first victims were all members of one family, Joseph and Julie Ortero and their daughter Josephine, 11, and son Joseph junior aged 9.
They were all smothered and strangled using a combination of ropes and plastic bags.
Detectives discovered evidence of systematic torture, leading them to dub the unknown suspect as the ‘Bind, Tie, Kill (BTK) murderer’.
His next victim, 21-year-old Kathryn Bright was stabbed. His next five, all young women, were strangled.
During his murder spree the killer wrote anonymous letters to police and local papers describing his crimes.
Then in 1991 the killings suddenly stopped. For 13 years the trail went cold until in 2004, for no apparent reason, the killer started to write again to the police, and using the newspapers, a dialogue was opened with detectives.
In one letter he asked if information could be gleaned from a computer floppy disc. The cops said ‘no’ but it was a deliberate deception.
His next communication was on a disc and from it police traced Dennis Rader to his home.
Rader, now aged 69 is now serving 10 consecutive life terms in jail.
Albert DeSalvo was the Boston Strangler who terrorised the female population of the American city between 1962 and 1964.
He killed 13 times, usually after spying on his victims and breaking into their homes.
DeSalvo’s oldest victim was Mary Mullen, aged 85. The youngest, Mary Sullivan, was only 19.
Although most of his victims were strangled, one was battered with a metal pipe and another was stabbed.
In 1964 the murders stopped, but a serial rapist spread fear across Boston. The attacker usually wore green clothes.
Eventually the ‘green man’ rapist was caught and revealed as Albert DeSalvo. Police were able to link him to the murders.
Declared insane, DeSalvo was sent to a high-security mental hospital but escaped. Recaptured, he was placed in the tough Walpole prison where in 1973 he was stabbed to death by another inmate.
8 - Ted Bundy
Bundy was probably America’s worst ever serial killer. He was executed in the Electric Chair in 1989 having confessed to the killing of 30 young women, but the FBI think the true tally of his crimes may be twice that number.
Bundy was handsome and charming.
Sometimes he got attention from women by pretending to be injured or disabled and by asking for help.
Bundy appears to have started his killings in the Seattle area, where he battered and strangled several victims.
He hid their bodies in remote country areas, often returning to visit them and committing depraved sexual acts on their corpses.
Detectives discovered he had decapitated many of his victims and kept their heads at his home for a period as ‘trophies’.
After leaving Washington State he continued his killing spree in Colorado and Utah.
It was there in Aspen he was first arrested, but he escaped from custody twice, the second time on New Year’s Eve 1977.
Bundy moved on to Florida where for he killed three more women in three weeks before being caught, tried and executed.
The bodies of many of his victims have never been found.