He was selected by the Oilers in the fifth round of the 1997 NFL draft after playing college football at Baylor University.
He was also a member of the Barcelona Dragons of NFL Europe and the Ottawa Renegades of the Canadian Football League (CFL).
[3] He was promoted to the active roster on December 12 and played in two games for the Oilers during the 1997 season, recording four solo tackles and one forced fumble.
[1] He played in all ten games for the Dragons that year, accumulating 19 tackles, three interceptions for 89 yards and a touchdown, four pass breakups, two sacks, and one forced fumble.
[4] He played in five games for the newly-renamed Tennessee Titans in 1999, totaling four solo tackles and one pass breakup.
[1] McCullough played in 11 games during the 2004 season, accumulating 37 tackles, one interception for 62 yards and a touchdown, two pass breakups, and one fumble recovery.