Kiefer Sutherland

The Manhattan district attorney will not pursue the head-butting case against 24 star Kiefer Sutherland, a spokeswoman for the prosecutor said.

"We declined to prosecute after a full investigation," Alicia Maxey Greene told TVGuide.com. "That included speaking to the complaining witness, who was quite uncooperative."

Check out photos of Sutherland on 24

Sutherland reportedly got into a skirmish with fashion designer Jack McCullough in May. McCullough accused Sutherland of breaking his nose by head-butting him after an argument broke out about an incident between McCullough and Brooke Shields. Sutherland and McCullough later resolved their differences and issued a joint statement in which Sutherland apologized and McCullough accepted.

See what Sutherland's 24 co-star said about the case

With the case dropped in New York, Sutherland also no longer faces a violation of his five-year probation term following a DUI conviction in 2007, according to the Los Angeles city attorney.

"Based on the evidence and information received from New York officials, as well as our own independent review of the evidence, we will not be seeking a violation of Sutherland's probation," spokesman Frank Mateljan told People.

TVGuide.com's calls to McCollough, the L.A. city attorney and Sutherland's attorney were not immediately returned.