Fowler has seven assists this season.
He returned to action Saturday.
Fowler had been out with an upper-body injury.
Financial terms of the deal weren't disclosed. "We're excited to sign Cam to a long-term contract," general manager Bob Murray said. "He's a character kid with a great chance to become an elite NHL defenseman." The 20-year-old Fowler had five goals and 24 assists in 82 games last season. Drafted 12th overall in 2010, he had 10 goals and 30 assists in 76 games as a rookie in 2010-11.
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