Genson Courtney, 23, was shot dead outside his girlfriend's flat in Greenwich on the evening of Sunday, July 3, 2011.
He was found slumped in his black Volkswagen Golf in Banning Street with a bullet wound to the head at 10.50pm and was pronounced dead in hospital five hours later at 3.43am.
Genson was the stepson of Dave Courtney, a well known reformed gangster who has written about his life of crime.
Mr Courtney told the Sun: "If anyone needed an advert to say crime doesn't pay then let Genson be that advert."
During the investigation detectives arrested four men aged 20, 27, 28 and 47. On September 21, 2012, detectives charged David Pinto, 32 [25/10/79], of Tyler Street, Greenwich, and Robert Bleach, 45 [21/2/67], of Halstow Road, Greenwich, with the murder.
They went on trial at the Old Bailey on April 24, 2013. The prosecution case was that Genson and his uncle had fallen out in the weeks before the murder.
Genson had been demanding that Pinto pay him £1,000 and the pair exchanged a series of aggressive text messages.
Prosecutor Jonathan Rees said: 'The prosecution suggest that the motive behind the killing was that David Pinto was concerned that Genson Courtney was after him and sought to eliminate the threat he posed.'
Genson, a drug dealer and cage fighter, was at his girlfriend's home when he received a phone call at 10.20pm. He was heard to tell the caller he would meet them in 20 minutes.
Shortly before10.50pm he was shot through the left eye at point blank range as he got into his car outside the flat.
It was claimed Pinto recruited Bleach to help him carry out the murder. Although the evidence against them was circumstantial, mobile phone records placed both men in the area at the time of the killing. It also revealed extensive contact between the two men before hand and placed Bleach near the scene the previous day.
On May 17 2013 the jury convicted both men of murder. On May 23 they were both jailed for life with a minimum of 31 years before parole.
Detective Chief Inspector Kenny McDonald from Trident said: "David Pinto and Robert Bleach decided to end an ongoing feud with Genson Courtney by using calculated, deadly violence.
"They plotted the attack, surveying the address they knew Genson Courtney would be staying at, and shot their victim in cold blood as he approached his car in a residential street.
"Genson Courtney had issues with members of his family, including David Pinto but there are many ways of resolving such issues. Violence is not one of them, but it if is used, those who chose this path will be pursued, arrested and put before the courts to face justice."
A tribute page was set up on Facebook at RIP Genson Pinto.