Grill is a native of Maize, Kansas, and attended Maize High School where he played multiple sports. As a senior, he averaged 18.4 points, 4.6 rebounds and 3.4 assists per game and was chosen to The Eagle's All-State team. Grill was ranked a three-star prospect in the class of 2019 according to 247Sports. He committed to play college basketball at Iowa State over offers from South Dakota State, UNLV, Kansas State and Creighton.
College career
Grill averaged 2.1 points and 1.7 rebounds per game as a freshman and made two starts. Following the season, he transferred to UNLV. Grill averaged 9.1 points, 3.2 rebounds and 2.2 assists per game. Coach T.J. Otzelberger was hired at Iowa State after the season, so Grill transferred back to the Cyclones. He averaged 6.4 points and 3.2 rebounds per game as a junior. As a senior, Grill averaged 9.5 points and 4.0 rebounds per game. He was dismissed from the team in March 2023, later revealing he had suffered from mental health issues. In April, Grill announced that he was transferring to Missouri. Grill suffered a broken wrist during his first season at Missouri, causing him to miss most of the season. In 2024–25, he averaged 13.7 points and 3.6 rebounds per game while shooting 39.6% from three-point range. Grill was named SEC Sixth Man of the Year.
Professional career
On June 26, 2025, after not being selected in the 2025 NBA draft, Grill signed an Exhibit 10 deal with the Chicago Bulls. He was waived on September 26 and joined their G League affiliate the Windy City Bulls. Grill averaged 11.2 points, 3.8 rebounds and 1.4 assists per game for the Windy City Bulls. On March 7, 2026, he was acquired by the Greensboro Swarm.
