Ardal O'Hanlan said the late Dermot Morgan had a million plans and that he 'reeled from shock' for a long time after the Father Ted star's death.
Dermot Morgan, who played Father Ted Crilly on the hit show, passed away suddenly from a heart attack in London in 1998 - the day after filming for the third and final season had finished.
Speaking on RTÉ One's Deirdre O'Kane Talks Funny the Carrickmacross-born comedian said he couldn't get his around Morgan's passing for a very long time. He said they had spent the night before he died celebrating the success of the show and discussing when they were going to see each other again.
He said: "Dermot always had a million different plans, he always had a million different projects on the go with different people and we were talking about when we would meet up next.
He continued: "My dad was with me and he was a medical doctor and he actually had said, 'God Dermot didn't look very well.'
"Then I got a call at 8am the next morning from Dermot's assistant John Fisher who rang me and told me the news.
"Your mind can't really process it. You are going from such a high to such a low. You can't process it. You are thinking of his family and you are reeling in shock. And I continued to reel in shock for a good while afterwards.
"It put career and comedy in perspective."
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O'Hanlon also recalled his audition for Father Ted, telling O'Kane that the only acting job in Ireland that he had done prior to Father Ted was a reconstruction for Crimecall.
He also admitted that he didn't have high hopes for Father Ted, thinking it would be "culty" and only a handful of people might watch it.
However, he said that when watched the first season back with writers Arthur Mathews and Graham Linehan he loved it.
"I remember loving it so much that didn’t see myself in it, so I wasn’t self-conscious."