Former Fianna Fail TD Charlie O'Connor is mourning the sudden death of his son at the weekend.
Robert O'Connor (35) was found dead at his partner's home in Rialto, Dublin, on Saturday.
His family are waiting for a post-mortem to be carried out to discover how he died.
Robert's father Charlie told the Irish Independent yesterday that his family were "devastated" at the sudden death of their son, brother and father.
"I had lunch with him last Tuesday and he seemed fine. We just can't believe that this has happened. We are now going to have to bury our own son, which is every parent's worst nightmare," said the former Tallaght TD.
Robert had been staying at his partner's home, but she was away when he died. Robert is survived by his father Charlie, mother Pauline, daughter Heather (12), and brothers William and Niall.
Robert had worked with his father in Dail Eireann but then studied at the Gaiety School of Acting and the Betty Ann Norton School of Drama.
He appeared in a number of productions, including films 'The Nixer', 'Rural Heat', and 'Portrait of a Zombie', as well as in stage plays 'Down The Flats', 'Hatchet', and 'Give us a Break'.
Meanwhile, the father of former Labour TD Patrick Nulty is to be laid to rest today. Paddy Nulty passed away suddenly last Friday.
He is survived by his wife Rose and children Patrick and Leanne. His funeral mass will take place at 11am in St Brigid's Church, Blanchardstown.