Helter Skelter presented the firsthand account of the murder who was a part of whose "family"?
Helter Skelter (book):  The book presents his firsthand account of the cases of Manson, Susan Atkins, Patricia Krenwinkel, and other members of the self-described Manson Family. 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".
Charles Manson