In his freshman season, he played with his future college teammate Jordan Woodard and won the Class 6A state title.

[3] As a senior, Doolittle averaged 24 points, 13 rebounds and five assists per game and led Memorial to the Class 6A state quarterfinals.

[5] Doolittle finished his career as his school's all-time leader in points, rebounds and games played.

[6] A four-star recruit and the top player from Oklahoma in the 2016 class, he committed to play college basketball when he was a junior in high school.

[9] On November 18, 2019, Doolittle was named Big 12 player of the week after contributing 19 points, a career-high 16 rebounds, and four assists in a win over Oregon State.

[17] Doolittle played three games for the Canton Charge in the G League hub season between February and March 2021.

[20] On October 16, 2021, Doolittle signed with Hapoel Eilat of the Israeli Basketball Premier League for the 2021–22 season.

[28] On December 11, 2024, Doolittle was ruled out for two to three weeks of action, after sustaining a groin injury in round ten.

[33] Doolittle's older brother, Kameron, played college football for Oklahoma State at the wide receiver position.