Thompson's announcement also ends his father's dream of watching his son quarterback the Sooners.
Charles Thompson seemed destined for stardom at Oklahoma before his February 1989 drug arrest, which landed him on the cover of Sports Illustrated in an orange jumpsuit and handcuffs.
The symbolic photograph came to represent all the perceived problems with Oklahoma football and ultimately led to legendary coach Barry Switzer's resignation four months later.
Charles Thompson spent 17 months in federal prison and wasn't embraced again within the OU football program until after Stoops' hiring in 1999.
Kendal Thompson became a high-school star at Southmoore, and committed to the Sooners in November 2009.
“I think one of the things that inspires him is the opportunity to finish something that I started,” Charles Thompson said last April.
As of right now, the Sooners return Knight, Bell and redshirt freshman Cody Thomas as their quarterbacks, and add 2014 signee Justice Hansen, the Edmond Santa Fe product who has enrolled early to participate in spring practices.
Bell may opt to graduate and transfer as well, although Stoops has implied that if he stays for his senior season, he could have an opportunity to play tight end.
Former Texas Tech quarterback Baker Mayfield has also enrolled at OU and intends to walk-on to the football program. Mayfield, who was a true freshman at Tech in 2013, lost his appeal to the NCAA for immediate eligibility at OU, though, and Stoops has said several times that his staff isn't interested in adding any transfer quarterbacks.