Filip Gustavsson stopped 20 shots to help the Wild snap a two-game losing streak.
Petr Mrazek made 23 saves and Nick Foligno, Marcus' brother, scored for Chicago, who matched their season-worst skid with a fifth straight defeat.
Lettieri swooped in to corral a Lukas Reichel turnover and found Marcus Foligno in front of the net for the tiebreaking goal at 10:07 of the third period.
Maple Leafs 5, Stars 4
William Nylander had two goals and an assist and Ilya Samsonov made 27 saves as Toronto defeated visiting Dallas.
John Tavares added a goal and two assists for the Maple Leafs, who were 3-for-3 on the power play and won for the fourth time in five games. Auston Matthews added a goal and an assist and Mitchell Marner also scored.
Evgenii Dadonov scored twice - one on a penalty shot - for the Stars, who had their four-game winning streak end. Jamie Benn and Wyatt Johnston also scored. Stars goalie Scott Wedgewood stopped 26 shots.
Rangers 3, Lightning 1
Jonathan Quick made 18 saves, Jimmy Vesey scored twice and New York beat visiting Tampa Bay.
Vesey scored his first goal early in the second period and added an empty-net tally shortly after Tampa Bay forward Anthony Cirelli's wrist shot missed wide right with 1:21 remaining in regulation.
Brandon Hagel scored for the Lightning, who had 22 shots blocked, saw a three-game winning streak end and lost for the second time in 10 games (8-2-0). Tampa Bay also lost Mikhail Sergachev to a scary lower-body injury in the second period when the defenseman collided with New York's Alexis Lafreniere.
