A nurse found guilty of murdering two women with lethal doses of insulin had previously been investigated for injecting the same medication into patients who did not need it during her problematic career. Megan Jean Haines, 49, was stripped of her nurse’s registration in 2008 after it emerged she had given insulin to non-diabetic patients on two separate occasions at a medical centre in Victoria. Six years later she used this same method to murder two women at a NSW North Coast nursing home after learning she was the subject of a potentially career-ending complaints investigation.