Laurence Billam pleaded guilty to the manslaughter of Shirley Billam, 82, by reason of diminished responsibility, but denied murder.
Mrs Billam was found dead at her home on 19 April, Exeter Crown Court heard on Thursday.
Ray Tully KC, prosecuting, told the court Billam’s pleas were acceptable to the Crown.
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Judge James Patrick, the Recorder of Exeter, adjourned sentencing until 20 November for the preparation of pre-sentence reports, including from the Probation Service and adult services.
“This is a rather unusual case, and social services are expecting to have to get involved sooner rather than later,” he said.
“I repeat what I said: it must be very, very difficult for Mr Billam’s family.”
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