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Yesterday afternoon, Kiefer Sutherland showed up to the 1st Precinct in lower Manhattan to turn himself in, and he was booked on one count of misdemeanor assault and issued an appearance citation. Sutherland was released on his own recognizance, and he will be allowed to travel prior to his June 22 arraignment.

As you know, Kiefer allegedly headbutted Proenza Schouler designer Jack McCollough at a party earlier this week, after the actor believed that McCollough had bumped into Brooke Shields. Hey, he was just trying to be a hero! Er...

The misdemeanor assault charge isn't going to be the problem for Kiefer though - if prosecutors in Los Angeles decide that the 24 star has violated his probation (stemming from his 2007 DUI), he could face up to 10 months in the slammer!