The parents of a man beaten to death by a neighbour who was undergoing a psychotic episode have told the Central Criminal Court that it is "unacceptable" that someone so dangerous and known to mental health services was living just a few doors from their "defenceless" son.

A man suffering from paranoid schizophrenia who killed his parents with an axe has been committed to the Central Mental Hospital in Dublin.

A young Cavan man accused of murdering his father has subtle brain difficulties that may result in an inability to control behaviour, a psychologist has told the Central Criminal Court.