Kellar participated in high school football and track at Lake Park High School. He was the league discus record-holder and a state meet finalist in shot put.[2]
College career
Kellar played for the Northern Illinois from 1982 to 1985. He recorded 298 career tackles. He earned Huskies' defensive MVP, First-team All-MAC and Associated Press Honorable Mention All-America honors in 1984. Kellar was named Northern Illinois tri-captain and garnered Second-team All-MAC accolades his senior year in 1985. He received the Broderick-Andres Award as outstanding Northern Illinois male student-athlete for the 1985–86 school year. He was also a two-time winner of the NIU Abe Rosenbloom Lineman Award in 1984 and 1985. Kellar was named to the All-Time Huskie Stadium Team in 1995 and the Huskies' All-Century Team in 1999. He was inducted into the Northern Illinois University Athletics Hall of Fame in 1993.[2]
Professional career
Kellar was selected by the Indianapolis Colts of the NFL in the fifth round with the 117th overall pick in the 1986 NFL draft and signed with the team on July 19, 1986.[3][1][4] He played in fourteen games, starting eight, for the Colts during the 1986 season.[1] He played in three games, starting two, for the team in 1987 before suffering a knee injury.[1][5] Kellar was released by the Colts on August 23, 1988.[6] He spent some of the 1989 off-season with the NFL's Green Bay Packers. He was released by the Packers on August 3, 1989.[7] Kellar also spent time with the Minnesota Vikings of the NFL during the 1989 off-season.[5] He was also a member of the Ottawa Rough Riders of the Canadian Football League in 1989.[8][9] He then retired from football.[5][9]