Police have released CCTV of a cyclist they hope to trace on the anniversary of a gun murder in east London.
Errol McKenzie was shot in the chest on Seymour Road playing fields in Leyton on 11 April 2010.
About an hour-and-a-half earlier Mr McKenzie, 37, had bought alcohol from a convenience store in Lee Bridge Road.
The images show two males on bicycles riding in and around the playing fields late on 10 April and in the early hours of 11 April.
Det Insp Lucy Kilgour, who is leading the investigation, said: "We are releasing these new CCTV stills in the hope that it will jog either the memories of the cyclists or locals who may have seen them on the night of the murder.
"Despite several lines of inquiry, these males have not been traced and they may hold significant information which could assist us.
'Desperate for answers'
"Errol was a well-loved son who appears to have been a completely innocent victim."
She continued: "A year after his murder his devastated family remains desperate for answers.
"We urge anyone with information to contact us and help bring those responsible to justice."
The Metropolitan Police has offered a £20,000 reward to catch those responsible for the fatal shooting.
A post-mortem examination found Mr McKenzie, who died at the scene, was killed by a gunshot wound to the chest.
No-one has been arrested over the murder.