Kmet was a star athlete in football and wrestling at John Hersey High School in Arlington Heights, Illinois.
[10] Projected by Mel Kiper Jr. as a sixth-round selection in the 1992 NFL draft, Kmet participated in pre-draft workouts with the Atlanta Falcons, Cleveland Browns, New York Giants and Jets, and Philadelphia Eagles.
[16] Kmet signed with the Chicago Bears in 1993; head coach Dave Wannstedt praised him in May minicamp, describing him as "doing a nice job.
[24] During his tenure in Chicago, he attracted notoriety from his teammates for his pranks; such antics included pouring buckets of water on players in their dormitories, applying Vaseline to chinstraps, and itching powder to shorts.
[25] Summer 1996 saw him switch back to defense as part of return stints with the Bills and Packers, both of which ended prior to the regular season, before he concluded his playing career.
[26][27][28] The following year, Kmet and Bears defensive tackle Jim Flanigan established Timeout, a monthly newspaper covering Chicago-area high school sports.