A 32-year-old man who stabbed his retired psychiatrist mother to death with a kitchen knife before attacking his sister and a passer-by, has been found not guilty of murder and assault by reason of insanity.

A forensic psychiatrist has told a jury that a murder accused who stabbed his mother to death was suffering from “paranoid schizophrenia” and would have been unable to refrain from his actions at the time.

The accused's sister said she heard her mum scream "stop" and said she was punched in the head when she tried to intervene.

A man in his 30's remains in Garda custody this morning, in connection with the death of a woman in South county Dublin.