Mairéad is floored when Tyler reveals knowledge of her affair with Dean in Thursday's Fair City on RTÉ One and the RTÉ Player.
The murder suspect drops the bombshell when he visits Mairéad at home.
"I'm calling Damien, he'll be back here in two minutes," says Mairéad.
"Fine," laughs Tyler. "How do you think he's going to respond when he finds out that you and Dean are having an affair?"
Fans can find out what happens next on Thursday on RTÉ One and the RTÉ Player at 8:30pm.
Fair City airs on RTÉ One and the RTÉ Player on Sundays, Tuesdays, Thursdays, and Fridays.
