[1] He became a three-star recruit and amassed 4,975 rushing yards during his high school career, earning two First-Team All-State selections, before choosing to go to Florida Atlantic University.

[4][5] During the 2017 regular season, he led all Football Bowl Subdivision (FBS) players with 162 points scored (27 touchdowns) and ranked fourth with 1,632 rushing yards.

[9] On December 2, 2017, in the Conference USA championship game against North Texas, Singletary rushed for an additional 164 yards and three touchdowns.

[10] On December 12, 2018, Singletary announced his intention to enter the 2019 NFL draft, finishing his college career as FAU's all-time rusher and with the sixth-most rushing touchdowns in FBS history.

[26] Singletary scored his first touchdown of the season in week 2 against the Miami Dolphins, a 46-yard run, in which he reached a top speed of 20.29 miles per hour according to NFL NextGen Stats.

[27] Throughout the first three months of the season, Singletary shared the backfield with Moss and free agent acquisition Matt Breida to middling results behind a poor run-blocking offensive line, before he was made the primary halfback.

Between weeks 14 and 18, he accrued at least 78 yards from scrimmage against the Tampa Bay Buccaneers,[28] Carolina Panthers,[28] New England Patriots,[28] Atlanta Falcons,[29] and Jets.

[2] Singletary's first touchdown from scrimmage in the 2022 season came on a two-yard pass from Josh Allen during a week 3 game against the Dolphins.

[34] His first two rushing touchdowns of the season came during a 33–30 overtime loss to the Minnesota Vikings, but he also lost a fumble during the game.

In Week 4 against the Pittsburgh Steelers, he threw a touchdown pass to Dalton Schultz as part of a trick play.