An example of a malignant hero serial killer was Richard Angelo, who was called the "angel of death", or angel of mercy. Angelo devised a plan where he would inject the patient with drugs, then rush into the room and attempt to "save" the patient so that he could be a hero to the patient's family. This motive of excitement from inducing a health crisis for the patient has recently been labeled as a professional version of Münchausen syndrome by proxy, a type of factitious disorder. Richard Angelo confessed to killing 25 of his patients.