The Garda Commissioner has apologised to a man wrongly convicted of the manslaughter of his teenage neighbour 50 years ago.

Martin Conmey was one of three local men accused of killing Úna Lynskey (19) who disappeared near Ratoath, Co Meath, in 1971, an incident that is the first programme in a new RTE series, Crimes and Confessions, later tonight.

The men claimed they were subjected to brutal interrogation by some Garda detectives, allegations that were strongly denied by the investigators involved.

Mr Conmey was convicted of manslaughter in 1972 and served three years in prison, but this was successfully appealed in 2010.

The Court of Appeal later ruled in 2014 that Martin Conmey’s conviction was a miscarriage of justice.

The families of the other two men wrongly accused – Dick Donnelly and Martin Kerrigan – have yet to receive a State or Garda apology and are calling for an inquiry into the investigation.

A Garda spokesman said that the outcome of the cold case unit’s review “will determine whether further action is required from An Garda Síochána”.

The spokesman added that “in general, in circumstances where a review of an investigation has taken place and this reveals it is appropriate, then an apology to an individual or individuals will be made”.

In 2014, the Court of Criminal Appeal strongly criticised the conduct of the Garda investigation in the case.