He was a technical adviser on boxing films for John Garfield, Elvis Presley, Jeff Chandler, James Cagney, George Raft, Tony Curtis,[1] and Kirk Douglas, among others.
Gray also trained and advised the actor, John Derek in the 1956 film The Leather Saint.
[3] As a boxer, Gray compiled a professional boxing record of 8-3-2 with 3 knockout wins.
[1] Gray died in Mexico while on location making the film Something Big in Durango, at the age of 58.
[1] He was buried in Los Angeles at Mount Sinai Memorial Park Cemetery.