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.
Police later confirmed that a man had died at the scene after being found in a stairwell to a basement apartment with a serious injury.
Detectives said early investigations indicated that it was an isolated attack.
Welsh starred alongside Ewan McGregor, Ewen Bremner, Jonny Lee Miller, and Robert Carlyle in T2 Trainspotting, playing the gangland figure Mr Doyle.
Author Irvine Welsh paid tribute to "his beautiful friend" on social media.
Writing on Twitter, the Trainspotting writer said: "Bradley John Welsh, my heart is broken. Goodbye my amazing and beautiful friend. Thanks for making me a better person and helping me to see the world in a kinder and wiser way."
In Danny Dyer's Deadliest Men on Bravo in 2008, Bradley Welsh described himself as a "born leader".
In the programme he discussed his past as a Hibs Casual football hooligan in the 1980s.
He talked about how he "mobbed and robbed" and was involved with organised "smash and grabs" at stores, including Jenners in Edinburgh.
He later became involved in organising security at hundreds of clubs in Edinburgh.