TOKYO (Reuters) - Akebono, an American-born sumo wrestler who became the first non-Japanese yokozuna grand champion, died of heart failure this month, the U.S. Forces in Japan said on Thursday. He was 54.

Born Chad George Ha'aheo Rowan in Hawaii, Akebono entered the sumo world in 1988 and rose to its highest yokozuna rank in January 1993. He later became a Japanese citizen.