The information came to light during An Bord Pleanála’s oral hearing into the proposed South Kerry Greenway, when a landowner outlined the correspondence sent to his late father, uncle and neighbour.
All three men passed away a number of years prior to the letters being sent, with one man having died in 1972.
Morgan Lyne, a landowner in Kells, said, following his father’s passing in November 2014, he notified the council that his mother was now the owner of the lands being sought.
However, in June 2016, a letter addressed to Mr John Lyne (RIP) invited him to attend a public consultation which was due to take place a week later in Cahersiveen.
Morgan Lyne said the letter, which was received by his 80-year-old mother, caused considerable distress; Mrs Lyne and her late husband were married for 54 years.
Letters were also sent to Mr Lyne’s late uncle, who passed away in 2011, and a neighbour who died in 1972.
He questioned the council’s logic of inviting deceased family members to public meetings.
Senior Engineer with Kerry County Council Tom Sheehy, who signed the letters, said the error was due to an issue with a system which speeds up the production and mailing of large volumes of correspondence.
Mr Sheehy said it was a genuine mistake and he apologised for any distress caused.
Mr Lyne’s submission was applauded by those in attendance.