LOS ANGELES — Rafer Johnson, who won the decathlon at the 1960 Rome Olympics and helped subdue Robert F. Kennedy’s assassin in 1968, died Wednesday. He was 86.

He died at his home in the Sherman Oaks section of Los Angeles, according to family friend Michael Roth. No cause of death was announced.

Johnson was among the world’s greatest athletes from 1955 through his Olympic triumph in 1960, winning a national decathlon championship in 1956 and a silver medal at the Melbourne Olympics that same year.

His Olympic career included carrying the U.S. flag at the 1960 Games and lighting the torch at the Los Angeles Memorial Coliseum to open the 1984 Games. Johnson set world records in the decathlon three different times.

Johnson won a gold medal at the Pan American Games in 1955 while competing in just his fourth decathlon. At a welcome home meet afterward in Kingsburg, California, he set his first world record, breaking the mark of two-time Olympic champion and his childhood hero Bob Mathias.

On June 5, 1968, Johnson was working on Kennedy’s presidential campaign when the Democratic candidate was shot in the kitchen of the Ambassador Hotel in Los Angeles. Johnson joined former NFL star Rosey Grier and journalist George Plimpton in apprehending Sirhan Sirhan moments after he shot Kennedy.