Wasn't there an incident during June's stay at St. Andrew's in 1982 when she insisted on meeting Robert Boutflour in the car park because she didn't trust the nurses, then began to talk about provisions for her death? I'm not sure about nobody dying from a mental health issue: don't many people with schizophrenia hear voices telling them to do harm to themselves, and haven't we had Terry Butcher's son today dying from a mental-health related issue?
It's not only schizophrenia where people hear voices and hallucinate. A few too many ( not an overdose ) of paracetamol in some can cause the same thing. Lack of sleep also does the same.
Yes,RIP to Terry Butcher's son who'd experienced war in Afghanistan and never got over it. He probably suffered from PTSD to start with as a lot have and sadly whatever treatment he had,didn't work. Though we don't know the full details.
Sheila too had a set-to with the nursing staff thinking she was being poisoned. June was the most sick to my mind.