He made his pro debut at 19, on February 11, 2005, in Oklahoma City, stopping Mike Cooper (1–0) in the opening round.
He has also fought on ESPN and won by a second knockout against Deleon Tisley earning him the network's Play of the Day.
Williams fought veteran puncher Andre Purlette at the Twin River Event Center in Lincoln, Rhode Island.
Purlette recovered at the count of eight, only for Williams to unleash a barrage of punches that eventually caused the referee to stop the bout in the same round.
In 2022 the month, after 11 years away from the ring, Williams surprised the boxing world by announcing a comeback at the age of 36.