An Ohio woman with a history of prostitution stabbed to death a longtime Brother Rice High School teacher in a dispute over money, Orland Park police said Saturday. Alisha M. Walker, 20, has been named in a no-bond, first-degree murder arrest warrant in the slaying of Alan Filan, 61, in his Orland Park home last weekend, police said. Walker, of Akron, Ohio, was arrested early Friday in Fort Wayne, Ind., and is being held at the Allen County Jail there, awaiting extradition, police said in a news release today.