Fun facts:
Chicago is 0-1 all-time in Game 7 OTs (2011 @ Vancouver)
Detroit is 4-1 all-time, and 1-1 in the last 48 years. Their last loss was in 1993 against Toronto (Nikolai Borschevsky), their last win was in 1996 against St. Louis (Steve Yzerman). They've previously defeated Toronto, Montreal, and NY Rangers; they've never played Chicago or Boston in this scenario.
Yzerman's goal was the last time in the NHL that a Game 7 OT goal was scored beyond the first overtime.
This is the first time that a Game 7 OT has taken place after the first round since 2009 (Carolina and Boston, goal by Scott Walker).
Just in case, the last time that a defenseman scored a Game 7 OT goal was in 2001 (Darius Kasparaitis, Pittsburgh v. Buffalo)
No Game 7 OT goal has ever been scored shorthanded. The last power play goal was in 2004 (Martin Gelinas, Calgary v. Vancouver)
Game 7 OT goals have been scored in the first, second, and fourth OT periods. None has ever been scored in the third OT, or in the fifth or later.