Pittsburgh Penguins defenseman Olli Maatta was injured by a late hit to the head by Washington Capitals defenseman Brooks Orpik on Saturday night.
Here are the key takeaways from all of Sunday's action in the 2016 Stanley Cup Playoffs.
The Philadelphia Flyers were dominanted on Friday night, but stole a win, while the New York Islanders moved one step closer to their first playoff series win since 1993.
Flyers forward Scott Laughton left Game 4 on a stretcher after he hit the boards hard following a hit from Capitals defenseman John Carlson.
Here's a blow-by-blow of the most talked-about game of the 2016 Stanley Cup Playoffs so far.
Philadelphia Flyers forward Ryan White said he would have been involved with the Flyers fans that littered the ice with bracelets late in the third period of Game 3 on Monday night.
Flyers forward Pierre-Edouard Bellemare hit Capitals forward Dmitry Orlov from behind and the game only devolved from there for Philadelphia.
The Washington Capitals could be without Brooks Orpik for a while after he sustained an apparent head injury from a hit by Flyers forward Ryan White.
The Detroit Red Wings picked up a huge win over the Philadelphia Flyers, to help themselves in the playoff race and hurt the Boston Bruins in the process.
Columbus Blue Jackets forward Jared Boll was ejected for a late hit on Tuesday night and it did not seem to make coach John Tortorella very happy.

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