Gary Robinson , 46, also attempted to murder his mother, the Old Bailey hears.
Gary Robinson, 46, attacked his parents at their Buckinghamshire home on 24 March. His father died three weeks later.Robinson, of Newport Pagnell, also pleaded guilty to the attempted murder of his mother Margarete Robinson, 80.
The Old Bailey heard Robinson had been behaving bizarrely at home two days before the attack and was taken to hospital.He attacked his parents with a knife after he had been released from police custody, the court was told.It was heard psychiatrists agreed Robinson, of Chicheley Street, who had suffered mental health problems since 2016, was suffering from schizoaffective disorder.
"From what you said soon afterwards, so far as it made sense, you clearly intended to kill both of them. "And, as is apparent, you succeeded in the case of your father and you have no doubt left your mother in a desperately pitiful position." Robinson also pleaded guilty to assaulting an emergency worker and three charges of racially aggravated harassment on 22 March.
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