Actor Michael Clarke Duncan, who was nominated for an Academy Award for his performance in The Green Mile, has passed away at age 54, NBC News is reporting. Duncan’s powerful voice could be heard as the voice of Commander Vachir in Kung Fu Panda and as the voice of Tug in Brother Bear. In addition, Duncan also voiced numorous characters on Family Guy and was also the voice of Elder Marley in Delgo. Most recently, Duncan voiced the massive Kilowag in the live-action Green Lantern movie. Duncan passed away due to complications from a heart attack that he had on July 13th, one that he never fully recovered from.