Football star Rio Ferdinand has made a video appeal for information leading to the conviction of those responsible for killing a close friend.
Family friend Rio McFarlane, 18, was murdered in a drive-by-style shooting in the same area of south London where the Manchester United defender grew up.
The killing happened last September but no one has been charged.
The video of Ferdinand's murder appeal has been released on the Met Police's YouTube site.
The police released the video in conjunction with The Sun Newspaper.
The newspaper is offering a £10,000 reward in addition to £20,000 being offered by the Met Police for information leading to the identification, arrest and prosecution of those responsible for the murder.
The former England captain said: "I grew up in Peckham with Rio's brother Anthony and have known the McFarlane family for many years, so I wanted to do something to help them get justice for Rio's murder.
"I believe that the community can make a difference but it's important for people to come forward and talk to police."
In the appeal Ferdinand, 32, calls for people "to stand out from the crowd and be the best person you can be," and asks for witnesses to contact detectives.
Mr McFarlane died of a single gunshot wound to the chest on 6 September in Dragon Road, Peckham.
Police said he had no involvement in crime and believe his murder may have been a case of mistaken identity.
Four men arrested in connection with the killing are due to answer police bail in May. They are all under the age of 23.
Anthony McFarlane, Rio's brother, said: "It is impossible to describe the loss we feel. My brother was a good young man, who has been snatched from us through this violent murder.
"All we have left is the hope that, one day, we will see the person who killed him brought to justice."
Det Supt Gary Richardson from Operation Trident added: "There are people out there who clearly know who committed this murder.
"Rio McFarlane was a decent young man and his life was cruelly taken away from him. Trident want people to come forward and talk."