Investigators found human remains in William Spengler's burned-out house, where he lived with his sister, Cheryl Spengler.
The remains are assumed to be the sister's and a medical examiner will determine the cause of death, police said.
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A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.
A band of cloud and patchy rain is expected across Scotland and Northern Ireland, moving southeast as the day progresses.