The striking parallels between Lucy Letby and another killer nurse

The parallels between Lucy Letby and another killer nurse, Victorino Chua, are striking - both used synthetic insulin to attack their victims, showed zero remorse and even penned secret confessions nobody else was supposed to see.

Letby used insulin as a weapon twice to attempt to kill babies in her care, perhaps inspired by Chua who used the same technique many more times at Stockport’s Stepping Hill Hospital.

In May 2015 he was jailed for life with a minimum 35 years behind bars after a jury found him guilty of murdering two patients and poisoning a further 19 on wards A1 and A3 at Stepping Hill.

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Unnoticed by unsuspecting colleagues, he injected deadly insulin into saline ampoules and bags, leaving them for unwitting medics to administer to patients and causing their blood sugar levels to collapse alarmingly.

Eye-brows were raised when five patients crashed at the same time after Chua’s night shift of July 10, 2011, on ward A1.

Baffled medics used sugars like glucose and dextrose to revive patients, only to watch them crash again, unaware the saline drips and ampoules they were using had been sabotaged.

Still, no-one suspected foul-play, even when leaking saline ampoules were found with an antiseptic odour suggesting insulin. Staff reasoned that a faulty batch of insulin must have been the cause.

Eventually detectives pieced together the jigsaw, and the crucial breakthrough came when, miraculously, they found a frozen blood sample from one of Chua’s victims, Grant Misell, which should have been destroyed. They found it was stuffed with insulin.

The sample was sent to world-renowned anti-doping expert Mario Thevis, a forensic chemist at