Lemar attended St. Augustine High School, in San Diego, California.
[4] After high school, Lemar played college basketball at UC Davis, from 2013 to 2017.
[5] In his senior year at UC Davis, Lemar averaged 16.1 points and 3.3 rebounds per game.
[12] On February 23, 2023, Lemar joined AEK Athens, of the Greek Basket League, replacing Cameron McGriff on the team's squad.
[13][14] On July 20, 2023, he signed with Hapoel Jerusalem of the Israeli Basketball Premier League.