Jane Toppan, USA (1857 - 1938)
Jane Toppan was an American serial killer. In 1902, she confessed to killing 31 people. During her nurse training at Cambridge Hospital, she used patients there to experiment with morphine and atropine drugs. She used to alter the prescribed drug dosage to see how it was affecting the patients' nervous system. She enjoyed sitting next to the patients, and taking them closer to the death and bringing back to the life, ultimately killing them after sometime. Upon a complaint from a family, police investigated and arrested her on October 29, 1901. She was not found guilty by reason of insanity, and the court asked her to stay permanently at Taunton Insane Hospital.
This Post Belongs To 15 Serial Killer Quotes That Will Give Chills Down Your Spine 
