NEW YORK ( CNN ) -- Misdemeanor assault charges have been dropped against `` 24 '' star Kiefer Sutherland in a head-butting incident at a New York City nightclub , according to Alicia Maxey Greene , spokeswoman for the Manhattan District Attorney 's office . Kiefer Sutherland turns himself in to the NYPD on May 7 . Charges against him have been dropped . `` We decided to drop the charge after a full investigation , including after speaking to a complaining witness , who was uncooperative , '' Greene told CNN Tuesday . The charges stem from an incident in which Sutherland allegedly head-butted designer Jack McCollough at a New York City nightclub in May . McCollough had claimed he was `` the victim of a vicious , violent , unprovoked assault , '' according to a statement released after the incident from McCollough 's publicist.. Several weeks after the incident , Sutherland and McCollough issued a joint statement , through Sutherland 's attorney , in which Sutherland apologized .
Manhattan DA 's office : Misdemeanor assault charges against actor dropped . Charges stemmed from alleged head-butting incident at New York club in May . Kiefer Sutherland stars in the hit television drama `` 24 ''