Morrow -- a forward who logged 243 goals and 528 points over 13 seasons with the Stars -- went to the Penguins along with a third-round draft choice in return for defenseman Joe Morrow and a fifth-round 2013 selection.
"Brenden Morrow has represented everything we could ever ask for in a Dallas Star, giving his heart and soul to this franchise," Nieuwendyk said. "That being said, we had a great opportunity to acquire a young, top-end defenseman in Joe Morrow and we are delighted to add him to our organization."
Brenden Morrow, 34, waived his no-trade clause to make the deal happen. He has slumped to six goals and 11 points in 29 games this season after amassing 17 scores and 25 assists over 78 playoff appearances for Dallas.
Joe Morrow was the Pens' first-round selection in the 2011 draft. He has four goals and 15 points in 57 games for Wilkes-Barre/Scranton in the American Hockey League this season.
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