The vile nurses went on a seven-year killing spree at Vienna's Lainz hospital, telling investigators they had started killing elderly and dying patients out of pity

A twisted group of nurses dubbed the “Angels of Death” murdered up to 300 patients during a horrific killing spree - giving them overdoses of painkillers and drowning them.

Waltraud Wagner and Irene Leidolf went on a seven-year killing spree at Vienna's Lainz hospital between 1983 and 1989. They forced water into patients' lungs and injected them with large doses of insulin and tranquilisers. The twisted pair had two accomplices, Maria Gruber and Stefanija Mayer.

The serial killers told police they started killing elderly and dying patients out of pity in 1983. Wagner, then 23, was the first to kill a patient with an overdos

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