In order to show off his skills in bringing patients back from the brink of death, Niels Hoegel repeatedly injected people under his care with lethal medication. His colleagues mostly claim ignorance about his actions.
During his trial, the former male nurse admitted he intentionally brought about cardiac crises in some 90 patients because he enjoyed the feeling of being able to resuscitate them.
Niels Hoegel convicted for the murders of two patients is now thought to have killed at least 84 other patients, police say, calling it post-war Germany's worst killing spree.
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