Kiefer Sutherland was charged with assault after he allegedly head-butted a man at a party in New York on Tuesday, and now authorities in Los Angeles may come down harder on him, reports.

Sutherland, who’s currently serving a five-year probation term in Los Angeles for his second DUI conviction, may have violated those terms, which clearly state the actor must “obey all laws.”

Sutherland — who surrendered to police yesterday — allegedly came to the defence of actress Brooke Shields after Jack McCollough reportedly bumped into Shields.

“Our office intends to contact the NYPD and New York prosecutors to review the incident and determine whether Mr. Sutherland violated probation,” L.A. City Attorney spokesman Frank Mateljan tells People. A probation violation often means a return to jail. Sutherland previously spent 48 days in jail on his second DUI conviction.