Alleged poisoning victims William Dickson, 82, Linda McDonagh, 60, John Beeley, 73, Beryl Hope, 70, and Mary Cartwright, 89, are believed to have eventually died from natural causes.
BBC: Rebecca Leighton: Staff 'took' drugs from hospital
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Detectives are continuing to investigate and review the cases of 21 other patients, including six others - Tracey Arden, Arnold Lancaster, Derek Weaver, William Dickson, Linda McDonagh, and John Beeley - who all subsequently died.