(Jennifer Metcalfe). Carl tells Seth not to tell anyone he agrees not to but warns him if he catches them again he will. He later spots Carl and Mercedes hugging and gets the wrong idea they tell him it was just a hug but he doesn't believe them but doesn't tell anyone. He later has a go at Mercedes, unaware that Mitzeee is listening, who then becomes suspicious and informs her boyfriend Warren Fox (Jamie Lomas). Seth then leaves to go on Riley's stag do with Warren and Doug Carter (PJ Brennan). While on the stag do, Warren gets Seth a prostitute, so he can lose his virginity, in an attempt to get close to Seth in the hope that he will hear what secret he knows about Mercedes. He takes a pill and while having sex with the prostitute he begins to hallucinate and thinks he is having sex with Mercedes. He screams at her to get off and then falls asleep. When he wakes up, he finds the bed linen covered in blood, and the body of the prostitute outside, and presumes he has killed her. Warren then appears and sees what he had done and helps him get rid of the body and clean up the mess. Seth then starts to feel guilty for the murder and begins to see the ghost of the prostitute. He panics in front of Doug and ends up revealing Carl and Mercedes' affair to him. Seth considers suicide as the guilt becomes too much. Seth then tells Riley that he has killed the prostitute but Riley doesn't believe him, so he takes Riley to where the body is buried and he digs it up. However, when Riley unwraps the body, it is not the prostitute - but the body of a pig. It is revealed that Warren set Seth up and tricked him in to thinking he had killed the prostitute when on drugs, in an attempt to get close to Seth and discover what secret he knew. However Warren ends up finding out the truth from Doug as he threatens to let Riley drown unless Doug reveals his secret. Heidi is killed by her father Silas Blissett (Jeff Rawle), Seth's grandfather, by mistake and is later revealed he has killed many other women. Seth becomes aggressive within his grief. Mercedes and Riley continue to fight over their son, Bobby. Seth