FILE - A May 21, 1966 photo from files showing Henry Cooper after he challenged World Heavyweight boxing Champion Cassius Clay (later Muhammad Ali), at the Arsenal Stadium, London. Sir Henry has died aged 76, sources told Britain's Press Association Sunday May 1, 2011. He was well known for two famous clashes with Muhammad Ali in the 1960's flooring Ali in the 4th round of a 1963 non-title fight at London's Wembley, though Ali eventually won the fight. He fought Ali again in 1966 but was again beaten. (AP Photo/PA) UNITED KINGDOM OUT NO SALES NO ARCHIVE