He played in Major League Baseball (MLB) for the Toronto Blue Jays, San Diego Padres, St. Louis Cardinals, and Houston Astros.

Williams, a Cy-Fair High School graduate and University of Houston alumnus, began his career pitching in relief for the Toronto Blue Jays until he was moved to a full-time starter in 1997.

On December 12, 1998, he was traded to the San Diego Padres with minor leaguer Peter Tucci and Carlos Almanzar for right-handed pitcher Joey Hamilton.

[2] After a career-worst 2007 season with Houston, where he went 8–15 with a 5.27 ERA, and a poor showing during the 2008 spring training, Williams was released by the Astros on March 29 and subsequently retired.

Williams began coaching varsity baseball at Fort Bend Baptist Academy in 2009, and led the team to the Texas Class 4A semifinals in 2010 and 2011.