He died 3 Jun 2001, but much of his inaccurate autobiography is still repeated as if it was fact.
For anyone researching him, here are some key records:
According to the Social Security Death Index (SSDI) Jamake Highwater was born 14 Feb 1931.
According to the California Birth Index 1905 - 1995 (abstracts of birth certificates) Jackie Marks was born 14 Feb 1931 Los Angeles county CA. His mother's maiden name was Turetz.
http://www.californiabirthindex.org/birth/jackie_marks_born_1931_1464069What Is The California Birth Index?
The California Birth Index, or CABI, is a database that stores records of births in California from 1905 to 1995. The CABI was compiled by the California Office of Health Information and Research. The records are not stored in the form of birth certificates, but rather abstracts of birth certificates.
Also note:
Adopted persons may or may not be listed in the CABI. Additionally, the way they are listed varies. They could be listed under their birth names, adopted names, or both.
http://www.californiabirthindex.org/So this birth record doesn't tell us whether Jackie Marks was adopted (as he claimed) or not. But it does give us a birth date and other leads.