S13, E20: A woman is found on a park bench with her head bashed in by a walking stick, which turns out to be hers. She is Debra Landon, head of admissions for the Knowles School, one of the city's most elite private schools. The environment is beyond competitive for admissions and parents will do "anything" to get their kids in. The Detectives Briscoe (Jerry Orbach) and Green (Jesse L. Martin) find some angry messages on her voice mail. One of them is from Marvin Waters (Curtis McClarin), who was upset because his daughter Cassie didn't get the scholarship to Knowles she deserved. Instead the spot went to a Jared Anchin. The Detectives check out Marvin's alibi -- he's telling the truth and is no longer a suspect. An ultra fine blue cashmere fiber was found on the walking stick, and when the Detectives question Wyatt Scofield (Roger Rees), Knowles's headmaster, he's wearing a blue cashmere sweater.