The actor, who also appeared in an episode of Danny Dyer's Deadliest Men, died following a shooting in the city's Chester Street on Wednesday evening.
Holyrood Boxing Gym was the centre of the 42-year-old former British ABA Lightweight Champions world.
Bradley Welsh (at the very back) and his Helping Hands organisation hand out new bikes to the kids at Canal View Primary in 2017.
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Bradley Welsh visits the Sick Kids Foundation in 2014 to hand over 42,500 pounds he raised from sparring in the boxing ring for 24 hours. The money was used to purchase computers with special screens with eye recognition for children with disabilities who are unable to speak.
Bradley with Lezley Cameron of Spifox and Maureen Harrison of Sick Kids Foundation. Bradley said in 2018 he wanted to help make a "better society".
In 2018 Bradley told the EEN: Everybody knows my back story; about going to prison and using boxing to transform my life, but when I was in prison it destroyed my mum and I made her a promise"
Of course, I regret [my mistakes]. I have a daughter and a wee boy who is like a son to me, and I want a better society. Thats why I do what I do.
Bradley's Helping Hands organisation helped deliver 220 bikes to 12 primary around Edinburgh primary last year.
Group picture showing children with ex footballers organised by Helping Hands, including Paul Kane, Mickey Weir and Allan Preston. Bradley is at the back.
Bradley made the Guinness Book of World Records after he spent 24 hours in the ring as 360 people each engaged him in nonstop rounds of pads - a new world record that almost killed him.