A man questioned about his father's suspicious death in Derry has been released.
The 23-year-old son of taxi driver Mr Sean Quigg was freed from custody until a report is prepared for the Director of Public Prosecutions.
He was arrested by detectives investigating how Mr Quigg (50) died. He was found slumped in a chair at his home in Co Derry by a neighbour after raising the alarm.
Mr Quigg, who is believed to have suffered a heart attack, was discovered with cuts and bruises.
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He was still alive when the friend broke into the Glengrainne Gardens house in Park village, outside Dungiven on Sunday but died soon after.