Fair City's alpha schemer Oisín receives the dreaded knock on the door on RTÉ One on Sunday night when he is arrested on suspicion of Karen's murder.
Warning: spoiler alert!
Sunday's episode sees Oisín maintaining that he did not send the abusive texts to Karen.
"Check my phone," he tells Detective Inspector Yates. "I've never texted or called Karen."
But DI Yates and Sergeant Deegan then play their trump card - CCTV footage and phone records.
You can find out what happens next on Fair City on RTÉ One on Sunday, April 15, at 8:00pm.
Check out a clip from the episode below:
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Fair City airs on RTÉ One on Sundays and Tuesdays to Thursdays.
