Stewardson moved to Medicine Hat, Alta. in the leadup to the Olympics but was almost denied entry to the Games because of miscommunication between him and Boxing Canada. Stewardson's camp appealed the Canadian Olympic Committee's initial decision not to have Stewardson on the team and won the appeal just weeks before the Games were to begin.
Since Athens Stewardson has remained in Medicine Hat and in 2008 began a pro career in mixed martial arts. He won his first bout April 26 at an event called Urban Conflict at the Calgary Corral, defeating London, Ont. native Jacob McDonald with a knockout 39 seconds in to the first round. His second fight, July 19 at King of the Cage Canada's Excalibur event at Rexall Place in Edmonton, Alta., was against Vancouver, B.C. native Marcus Hicks. Stewardson won that fight by way of knockout at the 3:25 mark of the first round.