Actor Emile Hirsch served 15 days in jail after the 'Into the Wild' star pleaded guilty to a misdemeanor assault charge for putting a female movie executive in a headlock during a film festival, a court official said. Hirsch had initially faced a felony count of aggravated assault related to the attack on Daniele Bernfeld, which took place at the Tao nightclub in Park City, Utah, during the Sundance Film Festival.