Dallas (103 points) pulled away from second-place St. Louis (101). The Stars have four games remaining, and the Blues have five.
The loss eliminated the Coyotes from playoff contention.
Benn is the Stars’ first 40-goal scorer since Mike Modano in 1993-94, the team’s first season in Dallas.
Only Washington’s Alex Ovechkin has more goals this season (44) than the 2014-15 Art Ross Trophy winner.
Niemi’s 16 career wins vs. Arizona are his most against any team.
Mike Smith had 29 saves for the Coyotes.
Hanzal, who scored a goal in each of the three games between the teams this season, left after the first period because of an upper-body injury. The Coyotes also played without their leading scorer, defenseman Oliver Ekman-Larsson, because of illness.
Benn’s hit sent him to the penalty box for boarding, along with the Coyotes’ Antoine Vermette for roughing Benn.
Hanzal’s goal came on a snap shot from the slot after passes by Anthony Duclair from the right and Domi from the left pulled Niemi out of position.
Eaves scored with a wrist shot from the right faceoff circle.
Faksa scored off the second-period faceoff. Hemsky passed from behind the net to Faksa in front for his third goal in five games.
NOTES: Hanzal had three of his 13 goals and two assists in the Coyotes’ three games against Dallas. … Arizona LW Eric Selleck made his NHL debut, and D Alex Grant played in his third game and first with the Coyotes. Each received a fighting major, Grant for a bout with Dallas’ Colton Sceviour in the second period and Selleck against Jordie Benn in the third. … Stars D Kris Russell (lower body) missed his fifth game. C Tyler Seguin (Achilles tendon) remained out but could resume skating next week. … Arizona won the season series 2-1. … Hemsky has seven points (two goals, five assists) during his streak and has 13 points (four goals, nine assists) in his last 12 games. … The Stars have 12 players with 10 or more goals, one away from the franchise record of 13 last achieved in 1993-94. Valeri Nichushkin has scored nine.