Gray played at East Rutherford High School as a sophomore, averaging 22.5 points, 4.5 rebounds and 2.3 assists per game.

Gray accepted a scholarship to Houston when leading scorer Jherrod Stiggers turned pro a year early.

As a sophomore at Houston, Gray was suspended for a game versus SMU by coach Kelvin Sampson for being too selfish and not playing good defense despite his high scoring.

[2] Gray was suspended in the first game of his senior season due to playing in a church league after his friend paid the $5 admission fee.

[3] Gray became the American Athletic Conference's all-time scoring leader on February 11 in a 73–42 victory over Tulane, breaking the record set by Nic Moore.

[5] Gray hit the game-winning layup with 1.1 seconds to go to beat San Diego State 67–65 in the first round of the NCAA Tournament.

[10] After going undrafted in the 2018 NBA draft, Gray was signed by the Houston Rockets for their summer league team in June 2018.