The former Arnold Classic champion's death was confirmed by Generation Iron yesterday.
McMillan was widely reported to have suffered a heart attack while working out on a treadmill.
His death comes shortly after he opened up about past heart issues and had a near death experience last year.
Cedric McMillanwon his first bodybuilding competition in 2011 at the Orlando Show of Champions.
Prior to his death, McMillan openly talked about his struggles with his heart, and in November 2021 he discussed his reasoning for not competing in the Arnold Classic.