This will be a massive subtraction to the Stars' roster as they chase a playoff position for the rest of the season. Heiskanen has 29 points in 52 games this year, with stellar underlying numbers that have placed him in the Norris Trophy discussion, notably from Dom Luszczyszyn at Athletic
This could certainly impact Dallas' decision to move defender John Klingberg ahead of the trade deadline. There's now a strong possibility Klingberg remains a Star, and potentially, the Stars may look to add on defence to mitigate the loss of Heiskanen.