Sonny Rollins, at age 18 - 20 used to hang out for hours in the Harlem apartment of Bud Powell and the upper west side apartment of Thelonious Monk on 63rd St.
Sonny and his young friends, aspiring young musicians all, would go to both Powell's and Monk's apartments to "jam out" and work out their jazz vocabulary on their respective instruments. This included Kenny Drew on piano, Jackie McLean alto sax and young sax phenom Andy Kirk Jr. the son of band leader Andy Kirk.
Both Rollins and McLean state that Kirk Jr. was the better player and could have been one of the all time greats but, unlike Rollins and McLean who kicked heroin, the drug, which Rollins called the scourge of the jazz scene at the time, heroin won the battle with Kirk Jr. and eventually killed him....
Further Kirk Jr. info on a forum thread by ghost of miles here: