The family of a man stabbed to death by his schizophrenic stepson has said that the mental health system in Ireland had let two families down.

The parents of a man, who has pleaded not guilty to murdering his mother's partner by reason of insanity, took him to hospital just weeks earlier after he told them he had to kill the deceased.

Latest: A teenager has appeared in court charged with the murder of a 52 year old man in west Dublin.

The partner of a man who was fatally stabbed at her home on Wednesday night arrived at the scene shortly after the attack, it has emerged.