Kiefer Sutherland turned himself in to New York City cops today and promptly got charged with misdemeanor assault, E! Online reports. The 42-year-old star of 24 reportedly head-butted fashion designer Jack McCollough at a party. Sutherland, who says he was sticking up for Brooke Shields, will be arraigned on June 22. Across the country, prosecutors in LA are trying to figure out whether Sutherland violated his probation on a DUI arrest during the melee. If so, he could spend 10 months in jail.