A man who claimed he cremated the body of missing teen Natalee Holloway has been stabbed to death. Police say 32-year-old John Ludwick was killed in self-defense as he tried to kidnap his ex-girlfriend, Emily Heistand. She made a dramatic 911 call describing how Ludwick attacked her as she stepped out of her car last week. “Listen, he had a knife to my neck. He told me he was going to kill me if I didn't give him the keys,” she said in the call. Video shows him threatening her.