Arnfinn Nesset

Arnfinn Nesset was a nurse and killer from Norway. He used Curacet to paralyze the skeletal muscles. Including those that allow a person to breathe. While their heart beat, no air got in. His victims would rapidly suffocate to death in a painful and anxiety producing method. While his original claim was that he murdered hundreds. Eventually Arnfinn recanted his statements. In a trial that lasted five months, Arnfinn was found guilty and sentenced to the maximum-21 years. He was released after 12 years and passed away at age 89.

Sources:

https://medium.com/@chelsealynnqueen94/the-life-and-crimes-of-arnfinn-nesset-norways-infamous-serial-killer-5cb3c93c0afa

https://www.upi.com/Archives/1983/03/11/Norwegian-mass-murderer-found-guilty/4695416206800/

https://www.imdb.com/name/nm11257363/bio/?ref_=nm_ov_ql_1

https://www.worldabandoned.com/arnfinn-nesset-house-home-of-the-serial-killer