In his NHL career, Janmark has skated in 235 regular-season games, all for Dallas, registering 88 points (40-48=88). He has also recorded eight points (3-5=8) in 19 career games in the Stanley Cup Playoffs.
"Mattias is a relentless forward who combines his tremendous skating ability with sound positioning, making him a disruptive force," said Nill. "He is a versatile player that can play up and down the lineup at even strength, and was one of the key members of our penalty killing group, which was a top-five unit all season."
The 6-foot-1, 195-pound native of Stockholm, Sweden was originally selected by Detroit in the third round (79th overall) of the 2013 NHL Draft. He was acquired via trade by Dallas along with Mattias Backman and a second-round selection in the 2015 NHL Draft in exchange for Erik Cole and a third-round selection in the 2015 NHL Draft on March 1, 2015.