The 27-year-old also recorded 28 points (12G, 16A) in 64 games with the American Hockey League's Rockford IceHogs last year. In 13 games in the 2018 Calder Cup Playoffs, he notched five points (2G, 3A), helping the IceHogs to the Western Conference Finals.
Martinsen played in 64 regular-season games split between the Colorado Avalanche and Canadiens during the 2016-17 season. He tallied three goals and four assists in those games while also skating in two postseason contests for Montreal. Martinsen has played in 128 career NHL games, tallying 19 points (8G, 11A). He became the eighth Norwegian to play in the NHL after making his debut on Nov. 10, 2015 and the first to ever play for the Blackhawks on March 20, 2018.
Martinsen was undrafted and spent three seasons playing professionally in Germany with Dusseldorfer EG in the Deutsche Eishockey Liga prior to signing as a free agent with Colorado on May 15, 2015.