Watch " " Online Free HD Soap2day. He called himself the Angel of death but when the police department discovered that he was involved in over 40 deaths his name soon became Killer nurse in the beginning it was his story against theirs. Soon he gave up his version of the events and admitted to killing 43 patients in his care at St. Mary's hospital. Charles Cullen became one of the most notorious serial killers in the history of the US.