Charles Ray Hatcher was considered to be one of the most deadliest serial killers in the United States. It was confirmed that he killed 4 people but he confessed to killing 16 people from 1962 to 1989. His crimes are all over the place, Missouri, California, and Illinois.

Sources:

https://www.newspapers.com/clip/27050973/1984-charles-ray-hatcher/

https://www.upi.com/Archives/1983/10/13/A-man-who-may-have-confessed-to-as-many/2963434865600/

https://www.benoakley.co.uk/charles-ray-hatcher-one-man-crime-wave-serial-killer-encyclopedia