Born in Grand Rapids and raised in Detroit, Lee competed in basketball growing up and began wrestling during his junior year at Southfield High School. Lee was talented enough to continue his wrestling career at Grand Valley State University, where he was a national tournament qualifier and went 37–0 as a sophomore. However, with two years left of wrestling eligibility at the school, Lee dropped out to focus on a career in mixed martial arts. Kevin’s younger brother Keith Lee is an aspiring fighter and trains with Kevin at Xtreme Couture.
Mixed martial arts career
The Ultimate Fighting Championship
Lee made his promotional debut against Al Iaquinta on February 1, 2014 at UFC 169. He lost the fight via unanimous decision.  After the loss, Lee moved from his native Michigan to Las Vegas, searching for improvements to his game.
Lee faced Magomed Mustafaev at UFC Fight Night 99 on November 19, 2016. He won the fight via submission in the second round. The win earned Lee his first Performance of the Night bonus award.
Lee faced Michael Chiesa on June 25, 2017, at UFC Fight Night 112. He won the fight via submission at the end of the first round. The win also earned Lee his second Performance of the Night bonus award. Chiesa appealed to the Oklahoma State Athletic Commission to overturn the defeat, claiming referee Mario Yamasaki erred both in stopping the fight despite no tapout nor loss of consciousness and in allowing Lee to use illegal downward elbows, which cut his head.
Lee fought Edson Barboza on April 21, 2018 at UFC Fight Night 128. At the weigh-ins, Lee weighed in at 157 pounds, one pound over the lightweight non-title fight upper limit of 156 pounds. As a result, the bout proceeded at catchweight and Lee was fined 20% of his purse which went to Barboza. Lee was rocked badly by a spinning heel kick, and was nearly finished by Barboza in the third round, but rallied back and defeated Barboza via doctor stoppage (cut) at 2:18 of the fifth round. 
Article source: https://en.wikipedia.org/wiki/Kevin_Lee_(fighter)