The high doses of insulin starved their brains of glucose, causing coma and death.

The young Glaswegian nurse had attempted to kill one patient
and murdered three more before he became arrogant.

He announced to colleagues that a patient would die that night, probably around 5.30am.

Bridget Bourke was one of the first victims of the killer nurse.

Irene Crookes was also killed with a high dose of the diabetes drug.

Doris Ludlam, another victim. The court heard that Norris found old women a nuisance.

Ethel Hall, the fourth and final victim. When she died after a three week coma, Norris was arrested.

Vera WIlby was lucky to survive an insulin overdose administered by Norris.

Footage from police CCTV cameras of Norris being interviewed about his crimes.