Bradley Welsh, 48, who also featured in an episode of Danny Dyer's Deadliest Men, was killed outside his home in Chester Street at 20:00 on Wednesday.
Police have confirmed that the death is being treated as murder.
One resident said he was told someone had been shot in the head and people were instructed to stay indoors as the street was cordoned off.
Armed officers were sent to the scene after receiving "multiple reports" of a firearm discharge.
