The Bruins have announced that Nathan Horton sustained a severe concussion in Game 3, and will miss the remainder of the playoffs. Horton will not be made available to the media for the foreseeable future.
Until game 3, Horton's first playoffs could only be described as an unqualified success. The Bruins surely would not be three wins from a Stanley Cup without Horton's trio of game-winning goals. At this point, the hope is that he will be 100% for next season.
Presumably, Tyler Seguin will return to the lineup on the third line. Both Michael Ryder and Rich Peverley filled Horton's spot on the first line last night, so it's anyone's guess which will stay there. However, Ryder has arguably been Boston's best forward in the playoffs Stanley Cup Finals, so Claude Julien may opt to ride the hot hand.
UPDATE: Horton won't be the only one sitting out the remainder of the Finals; Aaron Rome has been suspended four games for the hit. In light of how badly the NHL botched the handling of Alex Burrows' bite of Patrice Bergeron, it would have been amazing if Rome got off with less.