A hitman has been jailed for life for murdering a womanising prison officer in a punishment attack.
Mr Chapman also worked as a doorman
Mark Dorling, 38, of Crystal Palace, south London, was convicted of killing Aaron Chapman at his home in 2002.
An Old Bailey judge said the attack was a planned, organised crime and ordered Dorling to serve a minimum of 25 years.
His 23-year-old victim from Sutton was a body builder who often cheated on women and was suspended from his prison job for moonlighting as a bouncer.
James Pearson, 38, of Kingswood, Surrey, was also tried for Mr Chapman's murder, but was cleared.
He was sentenced to 13 years in jail after being convicted of conspiracy to wound with intent to cause grievous bodily harm and admitting firearms offences.
Judge Giles Forrester told Dorling: "You were acting as a professional hitman whose job it was to teach Mr Chapman a lesson for some perceived wrong.
"Having lost your occupation in the prison service you started working for an organisation called The Firm.
"It was a savage murder delivered with utter brutality. I have no doubt you were paid to carry out this revenge attack."
He described Dorling, a former prison officer, as intimidating, threatening, arrogant and devious.
Dorling worked for an organisation called The Firm
The court had earlier heard there were rumours circulating that Mr Chapman was too close to some of the prisoners at High Down Prison in Sutton, that he was supposed to be guarding.
It was also alleged he had had an affair with the wife of at least one serving prisoner.
David Williams, prosecuting, said: "There were whispers he might be involved in bringing in drugs or other contraband."
On December 10, 2002, Mr Chapman called the emergency services to his home, saying he had been stabbed.
Ambulance and police crews found him alive and conscious but covered in blood with a 7in (17.8cm) wound to his chest and heart.
The next day, despite an operation to save him, he died.