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.
What television drama does Kiefer Sutherland star in? When did this happen? what did manhattan da's office say was dropped What hit drama does he star in? What kind of charges was dropped against the actor? what did the charges stem from what show does kiefer sutherland star in
"24" May 7. Misdemeanor assault charges "24" Misdemeanor assault an incident in which Sutherland allegedly head-butted designer Jack McCollough at a New York City nightclub in May. "24"
question: What television drama does Kiefer Sutherland star in?, answer: "24" | question: When did this happen?, answer: May 7. | question: what did manhattan da's office say was dropped, answer: Misdemeanor assault charges | question: What hit drama does he star in?, answer: "24" | question: What kind of charges was dropped against the actor?, answer: Misdemeanor assault | question: what did the charges stem from, answer: an incident in which Sutherland allegedly head-butted designer Jack McCollough at a New York City nightclub in May. | question: what show does kiefer sutherland star in, answer: "24"