Mitchell had surgery on his knee in the offseason and re-injured it during the lockout. He had been trying to rehabilitate his leg during the season, but ESPN's report states that Mitchell had arthroscopic surgery on the injured knee and will miss the remainder of the season.
The veteran blueliner had career-bests of five goals and 24 points in 76 games last season, and was a plus-7 in helping the Kings win the first Stanley Cup in franchise history.
You could see out there that everybody was willing to compete, to sacrifice, even blocking shots to the end. Even in the third when we were up 5-0, guys were still working hard and blocking shots That's a nice feeling also for the future.
— Flames goalie Jonas Hiller after his team's 5-0 win over Carolina