According to Dale Lolley's always informative blog , receiver Cedric Wilson was arrested for a fight with his ex-girlfriend in a Pittsburgh restaurant. You may remember this same girlfriend had a standoff with police at Wilson's home a few months back.
Dale thinks, and I agree, that after this he is done as a Steeler. I think many of us thought he was likely done before this anyways because of his age, salary, and diminished role on the team.