Koy Detmer is a retired American football quarterback. He was originally drafted by the Philadelphia Eagles in the seventh round of the 1997 NFL Draft. He played college football at Colorado. He is the younger brother of former NFL quarterback, Ty Detmer and son of coach, Sonny Detmer. Koy Detmer has hand autographed this Colorado Buffaloes 8x10 Photo. FI Hologram and Certificate of Authenticity.