Undrafted, MacKenzie played junior hockey with the Thunder Bay Flyers of the USHL, before playing collegiate hockey with the University of Denver for four years. After his senior year with the Pioneers, MacKenzie turned pro signing with the St. Louis Blues on October 6, 2003.\n', '

MacKenzie made his professional debut in the 2003–04 season with Blues affiliate, the Worcester IceCats of the AHL. While never playing a game with the Blues, Mackenzie became a fixture in the AHL, playing with the Blues affiliates for 5 years.\n', '

On July 14, 2008, MacKenzie signed with the Colorado Avalanche and was assigned to affiliate, the Lake Erie Monsters, to start the 2008–09 season. MacKenzie received his first NHL recall on November 29, 2008, but did not feature in a game for the Avalanche. Towards the end of the season, MacKenzie was recalled again to the Avalanche on April 4, 2009, and made his NHL debut in a 4-1 victory against the Vancouver Canucks on April 5, 2009.\n', '

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