Everyone's a suspect in Carrigstown these days following the shock murder of Karen a couple of weeks ago, but her mother Aoife is firm in her belief that it was Oisin who did it.

Paul Brennan's son was arrested on Sunday night's episode however he has since been released, infuriating Aoife even more. Tonight's episode sees her take justice into her own hands when she visits Oisin and things turn violent pretty fast.

Watch below:

Catch Fair City tonight on RTÉ One at 8pm.