https://en.wikipedia.org/wiki/Susan_Atkins

Susan Denise Atkins (May 7, 1948 – September 24, 2009) was a convicted American murderer who was a member of Charles Manson's "Family". Manson and his followers committed a series of nine murders at four locations in California, over a period of five weeks in the summer of 1969. Known within the Manson family as Sadie Mae Glutz or Sexy Sadie, Atkins was convicted for her participation in eight of these killings, including the most notorious, the "Tate/LaBianca" murders. She was sentenced to death, which was subsequently commuted to life in prison. Atkins was incarcerated from October 1, 1969, until her death – a period exactly one week short of 40 years. At the time of her death, Atkins was California's longest-serving female inmate.