Lee 'Cabbo' Amos was jailed in 2009 for the drive-by killing of Tyrone Gilbert, 24.
G4S confirmed he had passed away at HMP Oakwood and an investigation is under way.
Amos was serving a minimum of 35 years for Gilbert's killing and was part of the notorious Gooch Gang which terrorised Manchester.
After they were jailed, it was reported shootings fell by 92 per cent. Amos, known as Cabbo, was regarded by the police as the Gooch gang's 'best weapon, as he was 'cool, calm and collected!
Gilbert was shot in the chest and killed at the wake of Ucal Chin, 23.
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