Police are offering a £20,000 reward for information about the murder of a DJ five years ago.
Wayne Powell, 38, who was a well known DJ in Hackney and performed under the name DJ Connoisseur, was shot dead in Chingford, north London.
His partner was pregnant at the time and his son, now aged four, was named in his memory. Father and son never had a chance to meet.
Police still have no idea why he was murdered.
Mr Powell was a keen bodybuilder and also worked as a customer assistant for the London Underground at Seven Sisters.
On the night he was killed he was sat in his black BMW close to the gym he used in Higham Station Avenue, Chingford Mount.
Just after 11pm a lone gunman walked up to the car and Mr Powell got out to speak to him.
The suspect then fired four shots before police describe him as "calmly making off along a footpath" in the direction of Coningsby Gardens.
The father-of-five, who lived in Stonebridge Road, Seven Sisters, north London, was taken to the Royal London Hospital where he was pronounced dead.
The incident happened on Monday July 2010.
The gunman is described as possibly black, about 5ft 10ins and was wearing a tracksuit.
After interviewing a number of witnesses police were given two possible descriptions of the murderer.
The first said the gunman was wearing a grey tracksuit with zip with his hood up.
The second said they thought they saw the gunman wearing a brown hooded top with the hood up and dark-coloured jogging bottoms
Anyone with information should contact the Met Police's murder squad on 020 8345 3715 or, if you wish to remain anonymous, call charity Crimestoppers on 0800 555 111.