Williams attended University High School in Waco, Texas and joined the varsity team as a junior under coach Rodney Smith.

[3] Williams attended New Mexico Junior College and averaged 10.1 points and 6.9 rebounds per game in his freshman season.

Williams missed the entire 2015–16 season due to a knee injury which required surgery, calling it one of the toughest years of his basketball career as TCU struggled to 12 wins.

[3] In the second round of the 2017 NIT, an 86–68 win over Richmond, Williams recorded the first triple-double in TCU history with 11 points, 14 rebounds and 10 assists.

[13] Williams later made his professional, NBA debut on October 17, 2018, in a blowout win over the Houston Rockets.

[17][18] On March 2, 2023, the Thunder announced that he suffered a left wrist injury and would undergo surgery to address the issue, ending his 2022–23 season.

[19] On February 7, 2023, LeBron James broke the all-time NBA scoring record whilst being defended by Williams.