Jack Sekely, a former film editor who spent many years working for the Walt Disney Studios, died in his sleep July 5 in his Del Mar home. He reportedly died of natural causes. He was 65.In 1967, Sekely joined Disney as an assistant film editor and remained with the studio until 1984. There are no family survivors. Memorial contributions in his name may be sent to the Helen Woodward Animal Center, 6461 El Apajo, Rancho Santa Fe, CA 92067.