Ann Doherty, whose twin sister went missing in 1977

Fianna Fail has declined to say whether a man accused of murdering Mary Boyle, a six-year-old girl who went missing from Donegal in 1977, was a member of the party.

At a meeting in Leinster House last week, Ann Doherty, Boyle’s twin sister, asked Micheál Martin, the Fianna Fail leader, to reveal if the man she believes killed her sister was in Fianna Fail.

Doherty alleges the garda investigation was obstructed after a phone call was made by a Fianna Fail politician.

Fianna Fail is to take legal advice on whether it should approach the politician about the accusation.

Doherty was accompanied to the meeting last week by her cousin Margo O’Donnell and Gemma O’Doherty, a journalist who has posted online an excerpt from a