Brenda and Lynton Anderson, both aged 94, died a year apart
Police have described their deaths as "alleged drug toxicity murders" and say both died from drug overdoses "after being deliberately administered medication".
They allege that that medication was given to Mrs Anderson four days before her death, while she was being treated as a patient at the Noarlunga Hospital, and to Mr Anderson at his Hackham home the day before he died.
"The arrested woman is a family member of Mr and Mrs Anderson," police said.
A woman related to a 94-year-old woman and her husband, who died in hospital a year apart, has now been charged with two counts of murder after she was arrested earlier today, SA police say.
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The family member was expected to be refused police bail and was likely to appear in the Adelaide magistrates court later on Tuesday or on Wednesday, police said.
Last week Det Insp Mark McEachern said concerns about Brenda Anderson’s death had been first raised during the coronial investigation, which examined the toxicology results.
“When an innocent explanation for toxicology abnormalities was eliminated, the possibility of Mrs Anderson’s death being a deliberate act by another party became the primary subject of the investigation,” McEachern said on Thursday.
He said police alleged “Mrs Anderson was killed by a person known to her and in close enough relationship to have been visiting her while she was in hospital”.
Adelaide detectives allege 62-year-old family member killed Brenda and Lynton Anderson a year apart by deliberately administering medication
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