According to detectives, Leroy Mitchell, 35, called police and paramedics early in the morning of October 2 to report a shooting in a car park.
He has appealed for information from anyone who may have attended a silent disco on Bird Horst Road on the night of October 1.
“Even if you don’t think you’ve seen or heard anything important, please contact the police,” said Chief Detective Catherine Goodon.
No arrests have been made.
Mr Mitchell’s family described him as a “devoted” father.
In a police statement, he said: “Leroy was a beautiful soul, hardworking, passionate about life. He valued his family and friends. He loved a lot of people, and that Will be felt for a long time to come.
Lero was from a hardworking family and the father of three children. He had a big family and a big heart, always took care of his mother and always tried to bring this family together. He was about to start a new job as a Royal Mail lorry driver, following his assassination on Monday.
“Leroy never gave up football training with his son and also took the son of a friend who lost his wife. He loved all those with whom he surrounded himself.
“Leroy’s future was very bright, seeing his children grow up and thrive in strong, positive independent adults. As a family, it’s hard to imagine that he’s so far away from us. Will be remembered. ”
Anyone with information can call the police on 020 8785 8244 or Crime Stoppers anonymously on 0800 555 111.