The Garda cold case unit is to revisit the disappearance and suspected murder of Donegal schoolgirl Mary Boyle.
Mary disappeared from her home in Cashelard near Ballyshannon on March 18, 1977.
Now gardai are taking a fresh look at the case in a new probe that is expected to last at least six months.
They will travel to Donegal and also interview retired gardai who were involved in the original investigation.
A Garda source told The Irish Star: “It is very important that members go in with no preconceived theories or suspects.
“They will follow the evidence.”
The investigation comes following the release of a new investigative documentary into the case by reporter Gemma O’Doherty.
The documentary includes claims by two former gardai involved in the case of political interference in the original investigation.
Former detective Garda Aidan Murray told the documentary he felt he was close to getting a suspect to confess when he was pulled back.
Another retired garda told the documentary: “The gist was that none of a particular family should be made suspect for Mary’s interference.”
Mary’s twin sister Ann believes she was murdered to cover up sexual abuse.
Ann said: “Mary had to be killed to stop her from telling.”
“I believe that Mary was sexually assaulted. That was the secret.”
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