The 25-year-old recorded 19 goals and 34 points in 81 regular-season games for the Star in 2017-18.
“Mattias is a strong and versatile player who always makes his presence felt when he is on the ice,” Stars general manager Jim Nill said in a release. “His intelligence and determination have built the foundation of a tremendous, young player, and we are thrilled to have him returning as a member of the Stars.”
The six-foot-one, 195-pound native of Danderyd, Sweden missed the entire 2016-17 season due to a knee injury which he sustained during the pre-season. During his rookie campaign in 2015-16, Janmark racked up 29 points in 73 regular-season games and finished the season tied for 11th among rookies with 15 goals and ranked 14th in points (29). He has also recorded five points in 12 career playoff games.
Janmark was originally selected by Detroit in the third round (79th overall) of the 2013 NHL Draft, and acquired via trade by Dallas on March 1, 2015 along with Mattias Backman and a second-round selection in the 2015 draft in exchange for Erik Cole and a third-round pick in 2015.