Pateryn, 26, had six points (one goal, five assists) in 24 games this season. He had trouble cracking the Canadiens lineup the past two seasons, but at 6-foot-3, 223 pounds, he plays a rugged game with a big right-handed shot from the point.
"I got a call from Montreal [Monday]," Stars general manager Jim Nill said. "They've been watching our team for a while. I sat down with our whole staff; it was a pretty big move. So we sat down and we talked about it. Lots of different factors that come into play with expansion, and this was the best move from our team moving forward. We hope the best for Jordie and hope he can go win a Stanley Cup."
The Canadiens have been seeking a puck-moving defenseman to play on the left side on one of their top two defense pairs. The acquisition of Benn could allow coach Claude Julien to keep Andrei Markov on the left side of the top pair with Shea Weber and put Benn on the left side with Jeff Petry on the second pair.
That would leave Alexei Emelin, who has played the majority of the season on the top pair with Weber, competing for ice time on the third pair with Nathan Beaulieu and Nikita Nesterov. All three are left-shot defensemen, but Nesterov has been playing on the right side. That would leave Beaulieu and Emelin to compete for ice time on the left side.
Benn also should help the Canadiens' penalty kill, which is perfect in 11 opportunities since Julien was hired Feb. 14 but which went into its game at the New Jersey Devils on Monday (7 p.m. ET; MSG+, SNE, RDS, NHL.TV) 19th in the NHL at 80.5 percent. Benn was tied for the Stars lead in average shorthanded ice time per game at 2:30, and also played 1:12 per game on the power play.
Pateryn is in the first season of a two-year, $1.6 million contract with an average annual value of $800,000 according to CapFriendly.com. He's played parts of the past four seasons in the NHL but never more than 38 games in one season. In 82 career NHL games with Montreal he has 13 points (two goals, 11 assists) and 59 penalty minutes.