NFL Network first reported the news.
The Redskins traded a conditional seventh-round draft pick to New England for Stork, a former starting center. It had already been reported that the Patriots were going to release him, which is when the Redskins offered a deal. The source said Stork gave Washington the initial impression he was excited to join the team, but talk of his possible retirement soon followed. It's uncertain whether that was over health concerns -- he's had four concussions -- or another reason.
Stork started 17 games in his two seasons with New England, including in the Super Bowl win over Seattle his rookie year. In Washington, he'll provide depth at center, and possibly guard, though there's a chance he'll eventually push starter Kory Lichtensteiger for the starting job.
Earlier in the day, Redskins coach Jay Gruden said he wasn't sure what the latest was with Stork, though he added, "I don't have any timetable. We'd like him here as soon as possible. We'd like to get him in, get a look and go from there."