Butler, 24, played all three of his NHL seasons with the Buffalo Sabres, posting 5 goals and 31 assists in 155 games.
Calgary acquired Butler, a restricted free agent, along with Paul Bryon on a draft day trade with the Buffalo Sabres in exchange for Robyn Regehr, Ales Kotalik and Calgary’s second pick in the 2012 Entry Draft.
We think that Randy is a very good coach. Our players think that Randy is a very good coach. We think that he's going to get the most out of this group. With the addition of the two assistants, a bit of a different dynamic, we're very comfortable that this is a quality coaching staff that's going to maximize the potential of this team.
— Maple Leafs GM Dave Nonis on head coach Randy Carlyle and his staff