Lenoir attended Crete-Monee High School, where he was a three-time All-Conference and a two-time All-Area selection at wide receiver. One of his teammates was future NFL wide receiver Laquon Treadwell. As a senior, he helped his team win the Class 6A state championship and received All-state honors. He finished his high school career with 140 receptions for 1,971 yards, 31 receiving touchdowns and 2 touchdowns on punt returns. He also practiced baseball.
College career
Lenoir accepted a football scholarship from Western Illinois University. As a freshman, he started all 12 games and became the first freshman in school history to lead the team in receiving yards. He also had 39 receptions and 7 receiving touchdowns. As a sophomore, he became one of only five players in school history to register 1,000 receiving yards in a single-season, and the only non-senior to reach that milestone. He also had 75 receptions and 7 touchdowns. Against Northern Arizona University, he made 8 receptions for 132 yards and 2 touchdowns. Against Illinois State University, he had 12 receptions for 195 yards and 2 touchdowns. As a junior, he recorded 83 receptions, 1,184 receiving yards and 10 touchdowns. Against Eastern Illinois University, he had a career-high 280 all-purpose yards, of which 156 yards came on kickoff and punt returns, setting the school single-game record with a 52.5-yard average on kickoff returns. As a senior, he posted 76 receptions for 1,093 yards and 7 touchdowns. Against Northern Arizona University, he set a career-high with 231 receiving yards on 11 receptions and one touchdown. Against Indiana State University, he had 11 receptions for 204 yards and 2 touchdowns. Against Missouri State University, he made 7 receptions for 142 yards. Against the University of South Dakota, he had his first punt returned for a touchdown. Against Illinois State University, he made 11 receptions for 131 yards. He also broke the Missouri Valley Football Conference All-time record for most receptions and finished third in receiving yardage. He finished his career with 47 starts out of 48 games, becoming the school leader in receptions, receiving yards, touchdowns, 100-yard games, 200-yard games, and consecutive games with a reception.
Professional career
On December 21, 2016, it was announced that Lenoir accepted his invitation to play in the NFLPA Collegiate Bowl. On January 21, 2017, Lenoir played in the NFLPA Collegiate Bowl and caught one pass for 12-yards, as he played for Jim Zorn's American team that lost 27-7 to the National. Unfortunately, Lenoir didn't receive an invitation to the NFL Scouting Combine. On March 14, 2017, Lenoir attended Northwestern's Pro Day and performed all of the combine drills. He also attended Western Illinois' pro day on March 30. 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. At the conclusion of the pre-draft process, Lenoir was projected to go undrafted and be signed as an undrafted free agent. He was ranked the 113th wide receiver in the draft by NFLDraftScout.com. On June 13, 2017, Lenoir was signed as an undrafted free agent by the Dallas Cowboys after the 2017 NFL Draft. 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. He was waived by the Cowboys on September 2, and was signed to the practice squad the next day. He was promoted to the active roster on December 29. On September 1, 2018, Lenoir was waived by the Cowboys and was signed to the practice squad the next day. He was promoted to the active roster on November 9, 2018. He was waived on December 24, 2018 and re-signed to the practice squad. He was promoted back to the active roster on January 8, 2019. In 2019, he was passed on the depth chart by other wide receivers during training camp. He was waived with a knee injury on August 7. He was placed on the injured reserve list on August 9. After the 2019 season, Lenoir was waived by the Cowboys on April 21, 2020.
