Dallas will receive Spezza and Ludvig Karlsson, and in exchange the Senators will get forward Alec Chiasson, prospects Alex Guptill and Nicholas Paul and a second-round pick in the 2015 NHL draft.
Let's make one thing clear: Jason Spezza has asked to be dealt several times in his career in Ottawa. #Sens— Bruce Garrioch (@SunGarrioch) July 1, 2014
Spezza, who spent his entire career with the Senators, had 23 goals and 43 assists last season, ranking 17th in the league in the latter category.
He is due $4 million in 2014-15, the final season of a seven-year, $49 million contract.
Chiasson scored 13 goals and added 22 assists for the Stars in 2013-14.