Brendan Kilduff, who was shot dead in Aghamore near Ballyhaunis on Tuesday, will be buried this afternoon.
Mr Kilduff had been checking on an elderly neighbour when he was killed.
Gardaí believe he was mistaken for an intruder.
A man in his 80s who was arrested in connection with the incident was released without charge on Wednesday.
The funeral will take place at the Church of St John the Baptist at noon.