A £20,000 reward has been offered to help catch the killer of a 25-year-old man who died following a shooting in south London six months ago.
Alfred Liverpool was pronounced dead at the scene of the shooting
Alfred Liverpool, also known as Alfie, was shot inside a flat at Clarence House, in Rushcroft Road, Brixton, on 27 April.
Four young men, wearing dark clothing and hoods, were seen by witnesses fleeing the scene.
Officers believe they may have assaulted others before the shooting.
Det Ch Insp Adnan Qureshi, said: "It has now been six months since Alfred was fatally shot, and despite extensive enquiries regrettably we are still unable to provide his family and friend's with the answers that they desperately seek.
"Why did this happen to their son? Who is responsible? What was their motive? These are the questions that we hope with the assistance of members of the community we will soon be able to provide answers."
He said he hoped the "substantial" reward offered would encourage people to come forward and make a statement.