A memorial Mass for a Roscommon priest brutally killed is taking place on Sunday in Castlecoote at 11.30am.
It's to mark the 40th anniversary of the killing of Fr Niall Molloy.
The 52-year-old died in Clara, Co Offaly, in July 1985, in the home of Richard and Therese Flynn.
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Richard admitted hitting him at least twice and was charged with his manslaughter - but he pleaded not guilty and was acquitted.
Angela Doyle is a former crime scene co-ordinator at Merseyside Police, who studied a reconstruction of the scene of Fr Molloy's death.
She has been speaking to Eoghan Murphy about her analysis.
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