In Norway Arnfinn Nesset served 12 years in prison and 10 years on parole for murdering 22 patients: https://en.wikipedia.org/wiki/Arnfinn_Nesset https://en.wik

In Norway Arnfinn Nesset served 12 years in prison and 10 years on parole for murdering 22 patients: https://en.wikipedia.org/wiki/Arnfinn_Nesset https://en.wikipedia.org/wiki/Arnfinn_Nesset . He may have killed as many as 138.