The goal was Richard's second of the game. Big brother Maurice scored as well, along with Dickie Moore as Canadiens rallied from three one-goal deficits.
Montreal never lead until the game-winning goal.
With Red Wings leading 3-2 in the third period, Moore took a pretty pass from Maurice Richard and blasted a slap shot past Hall at 11:20 for the tying goal, Canadiens then dominated play for the remainder of regulation but couldn't score the go-ahead marker.
Overtime was an up-and-down affair until Henri Richard carried the puck into the Detroit zone. He left the puck for Dollard St. Laurent near the blue line, who flipped it into the corner to the right of Hall. Bert Olmstead took control of the puck and Richard moved into position, taking the feed from Olmstead and snapping a shot at Hall.
Hall got a lot of the puck with his body, but the disc still managed to flutter over the goal line as the Forum crowd burst into celebration while Red Wings players bowed their heads, stunned.
Red Wings led 1-0 in the first period when Maurice Richard took a pass at the Detroit blue line from Doug Harvey and broke in alone on Hall, rifling a wrist shot that beat the Red Wings goalie on the stick side at 17:36.
Gordie Howe scored at 5:26 of the second period and Red Wings led, 2-1 after two periods.
Henri Richard's first goal of the night tied the game at 4:32 of the third period, but Red Kelly scored a power play goal at 7:22 to regain lead for Red Wings.
The loss ends a highly disappointing season for Red Wings, who expected to challenge for the championship. Instead, Detroit didn't qualify for the playoffs until the season's final game, and Red Wings lost the first three games of the semi-finals before winning Game 4 in Detroit.
Canadiens await the winner of Boston-Toronto to play for the Stanley Cup.
1st Period
DET- Delvecchio (Howe, Hollingworth) 8:57
MON- M. Richard (Harvey) 17:36
2nd Period
DET- Howe (Lindsay, Delvecchio) 5:26
3rd Period
MON- H. Richard (Turner, Olmstead) 4:32
DET- Kelly (Howe) PPG 7:22
MON- Moore (M. Richard, Harvey) 11:20
Overtime
MON- H. Richard (St. Laurent, Olmstead) 6:18
SOG
DET 5-7-8-1 = 21
MON 11-11-10-2 = 34
PP
DET 1-5; MON 0-2
Fights
McNeill (DET), M. Richard (MON) 10:48 1st; H. Richard (MON), Ullman (DET) 6:47 2nd
Goalies
DET- Hall
MON- Plante

Henri Richard scored two goals, including the game-winner in overtime