He played college football for the Alabama Crimson Tide, receiving All-American honors in 2023.

[1] He attended John Paul II Catholic High School, where he played basketball and football.

[7][8] In week 11, Arnold tallied ten tackles, two pass breakups, and a fumble recovery, as helped Alabama beat Ole Miss 30–24.

[9][10] Arnold finished the 2022 season with 45 tackles with one going for a loss, eight pass deflections, an interception, and a fumble recovery.

[13][14] In 2023, Arnold was named a first-team All-American after recording 63 tackles, 5 interceptions, a sack, and forced fumble.