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're buyers. We're committed to winning. That's what [owner Vinnie Viola] has said all along and what we've said all along. We want to win. We want to win a championship. We're putting the pieces together, step by step, and we're hopeful that Jaromir can lead these young guys to the promised land. It's a win-win for us.
— Panthers GM Dale Tallon on Jaromir Jagr, who he traded for from the Devils on Thursday