Kirsten Gilbert
US nurse Kirsten, dubbed the ‘Angel of Death’, was convicted of three counts of first degree murder, two counts of second degree murder, and two counts of attempted murder, for injecting epinephrine into her patients, causing them to have heart attacks. Growing up, the killer-in-waiting was a pathological liar, who manipulated people by faking multiple suicide attempts; she also had a history of regular violent outbursts and checking herself into psychiatric wards. She was convicted of her crimes in 2001, and was sentenced to life in prison.