On October 1, 2013, Kell verbally committed to San Diego State, picking the Aztecs over offers from Vanderbilt, Gonzaga and Oregon.

[2] As a freshman, Kell posted 5.6 points, 2.8 rebounds, and 1.6 assists per game and was named to the Maui Invitational all-tournament team.

[3] He helped San Diego State reach the NCAA Tournament as freshmen and beat St. John's in the first round.

[7] Kell had an injury-shortened senior season, missing time with an ankle injury suffered in a January 27, 2018, loss to UNLV.

Kell scored a career-high 28 points in the 82–75 victory over New Mexico for the Mountain West championship to send the team to the NCAA Tournament.

[9] Kell was released a month later due to a knee injury and joined the Moncton Magic of NBL Canada midway through the season.

He was named MVP of the Finals as the Magic defeated the St. John's Edge in the clinching game behind 41 points, nine rebounds, six assists and three steals from Kell.

[25] He made his debut on November 28, 2020, when he recorded 35 points, 6 rebounds and 6 assists in a game against Qatar in the 2021 FIBA Asia Cup qualification.