[1] Following the 2006 season, it was announced that McKenzie had signed with the Marion Mayhem of the Continental Indoor Football League.

Thomas went on to set many records in the UIFL's inaugural season, on his way to earning Defensive Player of the Year honors.

[6] His 12 sacks ranked 4th in the UIFL on the season,[7] earning him Honorable Mention All-UIFL North Team.

The Blue Racers had a disappointing season, but McKenzie did not, as he earned 1st Team All-CIFL honors for the 3 time in his career.

McKenzie re-signed with the Blue Racers for 2014 and has also seen spot duty as fullback; he scored two touchdowns (one at each position) in that year's CIFL Championship Game, a 38–26 loss to the Erie Explosion.