As a redshirt junior, he caught 27 passes for 230 yards and two touchdowns and was named first-team All-Mid-American Conference.

[2] In his only season with the Terrapins, Mabry started all 12 of the team's games and caught 13 passes for 155 yards and three touchdowns.

[3] He was waived at the end of training camp during final roster cuts on September 5, 2020, but was signed by to the team's practice squad the following day.

[5][6] Mabry spent the entire 2020 season on the Seahawks' practice squad and signed a reserve/futures contract with the team on January 11, 2021.

[13][14] He was promoted to the Seahawks' active roster on December 31, 2022 and scored his first NFL touchdown the next day on a seven-yard reception from Geno Smith in the second quarter of the game against the New York Jets.