Who killed Karen? It's the question that's currently plaguing the residents of Carrigstown and the top suspects are now scrambling to defend themselves.
In the a teaser video, Wayne pleaded his innocence while pointing the finger at Oisin.
However, Oisin and Carol then made their cases for innocence in a very persuasive manner and highlighted some of their top suspects for the crime.
In a new teaser clip, Sean has made his plea for innocence, insisting that he had nothing to do with Karen's death.
"It could have been anyone..."
— RTE One (@RTEOne) April 30, 2018
Seán (@RyanAndrews17) has a temper but is he capable of murder?@RTEFairCity tomorrow at 8.#WhoKilledKaren? pic.twitter.com/8AydYo4eBW
"Why would I have been angry at her? We weren't even going out so how could she have dumped me?", a visibly fuming Sean says.
"She was the one who was angry because she couldn't accept that. I wasn't afraid of her, I felt sorry for her. What happened must have been an accident, or a row that went wrong."
"It could have been anyone", Sean says, before adding: "Kerri-Ann...."
Find out what happens next on Fair City on RTÉ One at 8pm on Tuesday night.
To catch up on all of the action in Carrigstown, check out the RTÉ Player.