Robert questions Andy how he could think that he is capable of murder and throws the phone out of Andy's hand when he calls the police. Chas demands Aaron and Paddy tell her what they are hiding. Aaron tells her that he has hated lying to her and admits that Robert killed Katie and he helped him cover it up. Robert asks Andy to hear him out but Andy demands he tell the truth if he killed Katie. When he doesn't respond Andy takes his silence as a confession. (thetvdb.com)