Wallis accompanied Marty Schottenheimer from Cleveland to Kansas City in 1989 and worked behind the scenes for Schottenheimer, Gunther Cunningham, Dick Vermeil and Herm Edwards as a defensive assistant/quality control coach for 19 years before retiring in January 2008.

Wallis’ tenure with the Chiefs as an assistant ranked second only to Tom Pratt’s 21 years.

Wallis is survived by his wife Vicky and three sons: Tyson, Darvin, Jr. and Austin.