As first reported by Gary Washburn of the Boston Globe (via Twitter), Chris Wilcox won't return to action for the Celtics this season.
Wilcox, who was sidelined with a possible heart condition, was ruled out for the season after undergoing additional tests. For Wilcox's sake, we hope the move is precautionary, and that the tests didn't reveal a serious health issue.
As for the Celtics, Wilcox's absence means the team will almost certainly have to add another big man, whether it's via trade or free agency.