Timeline of events
October 12, 1971
Una Lynskey, a worker with the Land Commission, disappears after getting off a bus on her way home to the house she shared with her parents on Porterstown Lane, Ratoath, Co Meath.
July 14, 1972
Martin Conmey and Dick Donnelly convicted of manslaughter of Una Lynskey and sentenced to three years in prison.
On appeal, Donnelly's conviction set aside but Conmey's is upheld.
A third suspect, Martin Kerrigan, was kidnapped and killed by relatives of Ms Lynskey.
Conmey's new legal team writes to the DPP seeking the original book of evidence, triggering a long-standing campaign to overturn his conviction.
The DPP file is not available until 2009 – more than 250 statements have disappeared from garda custody since defence asked for the papers.
It also emerges that other statements by three key prosecution witnesses, favourable to the defence, were altered, suppressed or not disclosed to the original trial.
November 22, 2010
Court of Criminal Appeal quashes Conmey's manslaughter conviction.
Conmey later seeks a miscarriage of justice declaration on the basis of newly discovered facts relied on during his bid to overturn his conviction.
July 29, 2014
Court of Criminal Appeal declares a miscarriage of justice. The court says the conviction, following a jury trial during which three original statements of prosecution witnesses were suppressed by an unknown person – but connected with the prosecution – amounted to a miscarriage of justice.