The tie held until the Blackhawks took advantage of a bad break for the Kings to go in front again.
Williams had the puck behind the net when he fell, and Bickell made a slick pass to Kane, who beat Quick to give the Blackhawks a 3-2 lead with 3:52 remaining.
Keith missed Chicago's 3-2 win in Los Angeles on Thursday night after he was suspended for high-sticking Jeff Carter in the face in Game 3, opening a 20-stitch gash on the face of the star forward. The defenseman said it was an accident, and he was very pleased after the Blackhawks won Game 4 without him.
Back on the ice Saturday, Keith wasted little time in announcing his presence.
With the Kings in the middle of a line change, Keith got a pass from Michal Rozsival on the left side of the ice, skated in, and fired a long slap shot through Quick's legs at 3:42 for his second goal of the postseason.
The Blackhawks kept up the pressure as the Kings struggled to hold on to the puck, and a little patience by Kane led to a 2-0 lead just six minutes in. He waited while a scrum in front of the net took out Quick, and then put a shot over the prone goalie.
NOTES: It was the 38th playoff game in the past two seasons for Los Angeles. ... Toews and Bickell both had two assists. ... The Kings' previous longest game was a 4-3 double-overtime win at Vancouver on May 11, 1993. ... Kings captain Dustin Brown said after the game that he tore the posterior cruciate ligament in his left knee during Game 6 of Los Angeles' second-round series against San Jose. He didn't miss a game.