He played college football for the South Alabama Jaguars, where he was named the 2017 Sun Belt Defensive Player of the Year.

He received first-team All-Pro honors in 2022 for his special teams play after spending the majority of his early career on the practice squad.

He was named first-team all-area as a junior and honorable mention All-State as a senior after recording 39 tackles and five interceptions despite missing an extended period of time because of vertebrae fractures.

[16] Reaves made his first career start on October 24, 2019 against the Minnesota Vikings, making three tackles before leaving the game due to a concussion.

[22] In Week 17 against his former team, the Philadelphia Eagles on Sunday Night Football, Reaves recorded his first career interception off a pass thrown by Nate Sudfeld during the 20–14 win.

[27] Reaves made the Commanders' 53-man roster out of training camp in 2022, the first time in his career that he had done so after being a final cut in each of his previous four NFL seasons.

[35] Reaves proposed to his girlfriend, Mikaela Worley, on December 29, 2024 on the field of Northwest Stadium after a victory against the Atlanta Falcons.