Nunn attended high school at Simeon Career Academy in Chicago.
As a freshman, he received his first basketball scholarship offer from the late Rick Majerus, when he was still the head coach at Saint Louis University.
He listed among the schools he was considering Illinois, Marquette, Memphis, Ohio State, Oklahoma State, Texas A&M, and UCLA.

During his senior season, Simeon honored his contribution by retiring his jersey, No.
20, along with that of fellow senior standout Jabari Parker, No.
22.
Nunn and Parker thus joined Derrick Rose, Bobby Simmons, and Benji Wilson as the only other Wolverine basketball players to have their jersey numbers retired.
Over his high school career, Nunn helped lead Simeon to as many as four Illinois High School Association (IHSA) state titles.

Initially, he had verbally committed to Texas A&M before his junior year in August 2011; about two months later, however, he announced his de-commitment from that school and intent to re-open his recruiting process.
His father, Melvin, further explained that Kendrick felt he had committed too prematurely in the process and that he wished to explore all of his options.

After his official visit to Illinois, Nunn committed to play for the program under head coach John Groce on September 15, 2012.
Nunn attended high school at Simeon Career Academy in Chicago. As a freshman, he received his first basketball scholarship offer from the late Rick Majerus, when he was still the head coach at Saint Louis University. He listed among the schools he was considering Illinois, Marquette, Memphis, Ohio State, Oklahoma State, Texas A&M, and UCLA.
During his senior season, Simeon honored his contribution by retiring his jersey, No. 20, along with that of fellow senior standout Jabari Parker, No. 22. Nunn and Parker thus joined Derrick Rose, Bobby Simmons, and Benji Wilson as the only other Wolverine basketball players to have their jersey numbers retired. Over his high school career, Nunn helped lead Simeon to as many as four Illinois High School Association (IHSA) state titles.
Initially, he had verbally committed to Texas A&M before his junior year in August 2011; about two months later, however, he announced his de-commitment from that school and intent to re-open his recruiting process. His father, Melvin, further explained that Kendrick felt he had committed too prematurely in the process and that he wished to explore all of his options.
After his official visit to Illinois, Nunn committed to play for the program under head coach John Groce on September 15, 2012.
Kendrick Nunn