Horse racing-Former top jockey Swinburn dies, aged 55

(Adds quotes, background) LONDON, Dec 12 (Reuters) - Triple English Derby-winning jockey Walter Swinburn has died at the age of 55, British media reported on Monday. Nicknamed the 'Choirboy', Swinburn was 19 when he rode Shergar to a memorable 10-length victory in the 1981 Derby at Epsom. After retiring as a flat-racing jockey in 2000, he worked as a trainer between 2004-11. Swinburn also won the Derby on Shahrastani in 1986 and Lammtarra in 1995. "Very sad to hear about the death of Walter Swinburn. Brilliantly stylish and a genius in the saddle. A jockey that God hath retained. RIP," said 20-times champion jump jockey Tony McCoy on his Twitter account. John Francome, a seven-times champion jump jockey, described Swinburn's death as "a shock. "He was a gifted rider," Francome told At The Races television. "He had really good hands and did everything from instinct." (Writing by Tony Jimenez; Editing by Ken Ferris)