The 25-year-old center, who was a restricted free agent, had NHL career highs in goals (15), assists (24) and points (39) in 78 games last season.
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Selected by the Carolina Hurricanes in the fourth round (No. 96) of the 2015 NHL Draft, Roy has 64 points (26 goals, 38 assists) in 163 regular-season games for the Hurricanes and Golden Knights, and 17 points (five goals, 12 assists) in 39 Stanley Cup Playoff games.