The deal Friday came nearly five months after the Stars acquired the high-scoring forward in a trade from Ottawa just before the start of free agency.
Spezza has 18 points in his first 20 games in Dallas, with his 14 assists tops among the Stars and ninth in the NHL. He has 705 points (255 goals, 450 assists) in 706 career games.
The 31-year-old Spezza was the second overall pick in the 2001 NHL draft by Ottawa. In 11 seasons with the Senators, he had at least 65 points in a season six times, and three other seasons with at least 50 points.