ThanksFrom Wikipedia Unselected in the 1973 NFL Draft, Sixkiller had tryouts with the Los Angeles Rams in 1973, and with the Toronto Argonauts of the Canadian Football League in 1974. He signed with the Philadelphia Bell of the World Football League in September 1974, and played with The Hawaiians in 1975, Sixkiller and several other players quit the troubled team late in the season after the players were asked to take a 20% pay cut; the entire league collapsed a week later. He tried out with the San Diego Chargers in 1976.
Sixkiller was also a cast member in the 1974 film The Longest Yard. He is currently an executive for sports marketing firm IMG College, serving his alma mater, the University of Washington.