Gardaí are now treating as murder the disappearance of 45-year-old Tina Satchwell from her home in Youghal, Co Cork, in March 2017.
He has been taken to a garda station in Cork for questioning.Ms Satchwell was reported missing by her husband, Richard, on 24 March 2017.
Mr Satchwell described his wife as a generous person. She was one of a family of four sisters and three brothers.Her sister, Teresa Dingivan, said Ms Satchwell just would not get up and go. Three months after she was reported missing, gardaí conducted a technical and forensic examination of the couple's three-storey home on Grattan Street in Youghal and of their car.
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