Sportsnet reports that Walker's goal came shortly after the Capitals narrowed the gap to 3-2 on an Alex Ovechkin one-timer during a 5-on-3 power play with around eight minutes remaining.
Taylor Hall sent a pass up the left wing to Walker, who paused, then cut inside behind
Jack Roslovic and scored at 16:45 to restore a two-goal lead at 4-2.