ST: SWEET LADY VELMA

Velma is an American serial killer who was completely undetected until her last victim. She used the method of arsenic poisoning.  SOURCES https://allthatsinteresting.com/velma-barfield https://www.nytimes.com/1984/11/03/us/first-woman-is-executed-in-us-since-1962.html https://www.ncdcr.gov/blog/2013/11/02/velma-barfield-serial-killer https://www.amazon.com/Death-Sentence-Barfields-Crimes-Execution/dp/0525942556