Lenoir attended Crete-Monee High School, where he was a three-time All-Conference and a two-time All-Area selection at wide receiver.
As a senior, he helped his team win the Class 6A state championship and received All-state honors.
As a sophomore, he became one of only five players in school history to register 1,000 receiving yards (1,030) in a single-season, and the only non-senior to reach that milestone.
Against Northern Arizona University, he set a career-high with 231 receiving yards on 11 receptions and one touchdown.
He also broke the Missouri Valley Football Conference All-time record for most receptions and finished third in receiving yardage.
On December 21, 2016, it was announced that Lenoir accepted his invitation to play in the NFLPA Collegiate Bowl.
On March 14, 2017, Lenoir attended Northwestern's Pro Day and performed all of the combine drills.
During the draft process, Lenoir had private workouts and visits with multiple teams, that included the Chicago Bears, Green Bay Packers, Kansas City Chiefs, Oakland Raiders, Miami Dolphins, and Baltimore Ravens.
[4] On June 13, 2017, Lenoir was signed as an undrafted free agent by the Dallas Cowboys after the 2017 NFL draft.
[5] Throughout training camp, Lenoir competed for a roster spot as the fifth or sixth wide receiver on the depth chart.
He competed against Brice Butler, Lucky Whitehead, Andy Jones, and Noah Brown.
[13] On January 8, he was promoted back to the active roster after wide receiver Allen Hurns was placed on the injured reserve list.
[29] On February 25, 2024, Lenoir signed with the Michigan Panthers of the United Football League (UFL).