The unsolved murder of Una Lynskey in 1971 was the catalyst for a misguided revenge killing and a false manslaughter conviction, says Michael Clifford.

Martin Conmey says he drew strength from the release of the Guildford Four in 1989.

Martin Conmey was 20 years old when he and two others were wrongly accused of killing Una Lynskey, yards from her home near Ratoath, Dublin in 1971. Michael Clifford outlines his long battle for justice and arduous quest for a certificate of miscarriage of justice