I think maybe Sinead if she finds out it was Fraser in the car who crashed into her and stopped her getting to Katy in time...
Maybe Sam
sinead it is so obvious, ste is covering for her and that's why he's always on edge when people talk about it around him
she wanted revenge because he stopped her from seeing Katie before she died x
Possibly Sandy as she's leaving. It won't be one of the main suspects- Joe, Freddie, Trevor etc. They will throw in someone you least expect to be his killer.
I think it's Danny or Sandy but does anyone know for sure?