A grandmother was killed by her "devil-obsessed" grandson who had undiagnosed and untreated schizophrenia.
Conor Clarkson, 30, claimed he was Lucifer and beat Marlene McCabe, 71, with a doorstop at their home.
An inquest heard Ms McCabe and her daughter Sharon Clarkson had pleaded with medics for help for Mr Clarkson, who had been displaying "bizarre and worrying behaviour" in the weeks before the tragedy.