Killough grew up in San Antonio, Texas and attended Douglas MacArthur High School.
He initially committed to play college football at Texas Tech as a preferred walk-on and move to wide receiver.
[2] Killough ultimately enrolled at Texas State, where he redshirted his true freshman season before transferring to the University of the Incarnate Word.
[4] Killough began his coaching career as a graduate assistant at Bowling Green in 2017, where he worked with defensive backs and special teams.
Killough was promoted to inside wide receivers coach and added duties as the Cardinals' recruiting coordinator in 2020.