King grew up in Fayetteville, North Carolina before moving to San Antonio, where he played at William J. Brennan High School.

[2] The decision proved to be a good one, as King returned for the 2015–16 season and was named the Pac-12's Most Improved Player after averaging 13.6 points and 4.7 rebounds per game.

[3] The next season, King's role adjusted as the team added future NBA guard Derrick White.

[5] At the close of his career, King finished with 1,294 points and 681 rebounds, ranking him in the school's all-time top 20 in both statistical categories.

King scored 21 points and grabbed 9 rebounds in the game, earning Most Outstanding Player honors for the East squad.

[7] King then moved to the Portsmouth Invitational Tournament, another pre-draft camp, where he averaged 18 points and 7.7 rebounds, earning all-tournament honors.

[12] In his debut in the NBA G League on November 4, King recorded 22 points on 9-of-14 shooting, four rebounds, four assists and a block in a 118–108 loss to the Santa Cruz Warriors.

[13] King made his NBA debut on December 11, 2018, in a 111–86 loss to the San Antonio Spurs, playing six minutes and grabbing a rebound with no points scored.

His father, George Sr., is an Army veteran, while his mother, Tresse, a Chief Master Sergeant in the United States Air Force, died in Kuwait on August 3, 2021.