Following the loss, Williamson won two fights, beating journeyman Maurice Wheeler and undefeated prospect Mike Mollo within four rounds each, before facing former world title challenger Kali Meehan on October 6, 2007 at Madison Square Garden. Williamson, who was 39 years old at the time, lost by sixth-round TKO. He got his last chance to fight for the title in 2009, facing Ray Austin in the WBC heavyweight title eliminator, but was stopped in the fourth round. After that, Williamson fought sporadically, having fought three times before retiring in 2014 after losing to Eric Molina at the age of 45.