In a game against Oklahoma State at Lawrence in '74 Knoff came from the defensive backfield running full speed.
Alfred Nelms was also running full speed up the side-line as he had swept around the defensive line of KU and appeared headed for a touchdown, when suddenly Knoff bolted up the field and ran head on into Nelms causing them both to go unconscious.
Selected in the 2nd Round of the 1976 NFL draft by the Denver Broncos, he did not sign with the team due to health concerns related to his knee.
During his professional football career, Knoff spent his summer pursuing an MBA degree from the University of Kansas.
He was able to parlay this degree into a post-football career as a commercial real estate broker in Minneapolis – Saint Paul https://www.grandforksherald.com/sports/2094149-golden-years-big-time-run-began-40-years-ago==[permanent dead link] External links==