He is the father of former Australian professional tennis player Lleyton Hewitt.
Hewitt was a key position forward and kicked 529 goals in the SANFL, from 285 games. He made his league debut in 1970 at the age of 17 for the West Adelaide Football Club. He would top the Bloods goal kicking twice (1972 and 1976) and would go on to play 101 games and kick 248 goals for the club.
In 1973 and 1974 he played in the VFL with Richmond Football Club and although he could not bring with him his prolific goal-kicking from South Australia he did once manage five goals in a game against Fitzroy.
Hewitt returned to West Adelaide in 1976 and stayed for two seasons before joining Woodville in 1978. There he would kick 201 goals from 80 games with the club, including 83 in 1979 which saw him finish as the SANFL's leading goal kicker. He finished his career at South Adelaide with whom he played 86 games and kicked 78 goals before retiring in 1986.