When Kendall visited Aaron in jail, the deal was for her to get Duncan’s hair to put on the Oscar. That’s why she pulls hair out of Duncan’s shower. However I have no idea how Lilly’s blood was put on it. We know the Oscar wasn’t the murder weapon after all. So who has Lilly’s blood available? Terrence Cook was shot breaking into the teachers parents house. That’s why he was in the hospital. He was there longer because he was put on suicide watch as well.