As the family was getting ready to play the track, the undertaker Robert Gabriel pulled Ann aside.
Ann Phayer told C103's Cork Today Show: "He said that most people would have a recording and I was thinking 'oh my god, there's a problem now with the recording and they won't be able to do it.'
"Then, when he said that we actually have the man himself Daniel, I just couldn't believe it."
O'Donnell was on the other end of the phone line and sang the song live.
As for how this happened, O'Donnell explained: "We got a message from a lady called Delores. A few years ago, we did some work with Hidden Hearing and Delores works for the company and she's a friend of Ann's sister.