They won despite falling behind about 4 1/2 minutes into the game. Washington managed to kill off his hooking minor, but Tampa Bay maintained possession and, moments after the teams were at even strength, Killorn got a shot behind Holtby from close range.
Backstrom was a game-time decision but didn't play in each of the first three games of the best-of-seven series, which Washington leads 2-1.
Stamkos said he felt like the team had a bit of a chip on its shoulder after last season's disappointing finish and believed the team had put itself in position for playoff success this year. "And he sure did". Game five will be played in Tampa on Saturday night.
It's been a good series for the visitors as they have won all four games so far. After one period of play Tampa Bay holds a 2-1 lead. However, no one could solve Vasilevskiy late in the game. I think confidence is a big thing, and it's going well right now. But this time around, the Capitals enter Game 5 on a two-game skid.
"When he shoots it like that - he's done it for so long and scored so many goals from there - I think it is hard to cover him", Tampa forward J.T. Miller said of Stamkos.
"Our guys were gassed".
"There was no anger or anything going on in the (locker) room, " Cooper said. "Simpler play. Just a kind of, like, more gritty style".
Tampa Bay Lightning center Steven Stamkos (91) hugs goaltender Andrei Vasilevskiy (88), of Russian Federation, after Game 4 of the NHL hockey Eastern Conference finals against the Washington Capitals, Thursday in Washington. Vasilevskiy swatted at the puck with his glove to keep the puck out of the net.
Following one flubbed chance, Ovechkin threw his head back and looked up, the very picture of disappointment.
Brayden Point - The Lightning centre contributed a goal and an assist in Game Four at Washington; it was the third straight game in which Point recorded a goal and an assist, and he has 16 points (7 G, 9 A) in 14 playoff games. For the first time in the series, the outcome wasn't obvious until the final minute of play - although it should have been. He played well in the second two. "He's our leader. We all love him".
Capitals goalie Braden Holtby didn't get a chance to make almost as many saves, given the shot discrepancy: Washington ended up with 38 to Tampa Bay's 20. After Anthony Cirelli scored an empty-net goal with two seconds left, an angry Ovechkin broke his CCM stick over the crossbar.
"Tonight was so important", Killorn said.
For the first time in the series, the score was tied after two periods. It doesn't matter how we get it, " defenseman Victor Hedman said.
Alex Ovechkin sprung Evgeny Kuznetsov on a partial breakaway five minutes into the second period.
He adds: "If we play our game for 60 minutes, I like our chances". The Washington Capitals have allowed three or more goals in six of their last 10 games. Sometimes, numbers lie. Alex Killorn's game-winning-goal came seconds after the penalty to Lars Eller had expired.
Though the Capitals have just one playoff loss on the road, they've occasionally struggled at home, following a postseason trend around the league.