The Cowboys have signed veteran running back Sammy Morris in the wake of DeMarco Murray's season-ending ankle injury. Morris, 34, played 11 years in Buffalo, Miami and New England but has not played this year after getting cut by the Patriots in training camp. "I hadn't heard anything for a while so I assumed that I'm going to ride into the sunset," Morris said. "So I got the phone call. ... I all but said I was done in my mind, but it didn't turn out that way."