Kenneth Dewayne "KJ" Jefferson Jr. (born May 20, 2001) is an American football quarterback.

Jefferson attended North Panola High School in Sardis, Mississippi.

[4] A four-star prospect, he committed to play college football at the University of Arkansas.

[5][6] Jefferson spent his true freshman year at Arkansas in 2019 as a backup to Nick Starkel who lost the starting job to SMU transfer, Ben Hicks.

[8] He finished the season, completing 14 of his 31 passes for 197 yards with one interception and also rushed for two touchdowns before redshirting.

Jefferson started for Arkansas in their season-ending Outback Bowl game versus Penn State, and led the Razorbacks to a 24–10 victory, and a 9–4 final record.

Four of Arkansas' six losses (Texas A&M, Liberty, LSU, Missouri) were by a grand total of nine points.