The body of a man who died in custody at Buncrana Garda Station was removed to Letterkenny General Hospital where a post mortem examination was carried out.
It is understood that the circumstances of his death are not suspicious.
The man has been named locally as Michael Lynch who was in his early 60s and lived at the Sliabh Sneachta Housing Estate, Buncrana.
It is not yet known why he was in custody .
The Garda Ombudsman's office has confirmed it is investigating the incident.