I am trying to find any citation, possibly in the CFR (Code of Federal
Regulations), or any documentation that proves or establishes that a
person must hold a legal degree to become a Justice of the US Supreme
Court. I don't believe a person has to be a lawyer, i.e. a practicing
attorney who has passed a state bar, but I believe a person does have
to hold a legal degree to be appointed to the Supreme Court.  If
anything can cite the exact requirements to be eligible for
appointment, I'd like to read it or know where to find it.
Many thanks.

Hello gizmogal and thank you for the question.

Infact there are no qualifications needed to become a Justice of the
US Supreme Court, although in practice they all have legal training
and are 'qualified' although this is not a formal requirement.

-------------------------------------------------

"What are the Qualifications Required to be a Justice of the Supreme
Court?

There are neither Constitutional nor statutory qualifications for
appointees to the supreme court. Determining the qualifications of the
individuals selected is left up to the president who nominates, and
the members of the Senate, who confirm individuals to the court."
*Available only in the Google cache*
http://216.239.35.100/search?q=cache:9elubPDOpYEC:https://penn0064.netsafa.navy.mil/ipg/Judicial_Processes.htm++%22+to+be+a+Justice+of+the+Supreme+%22+++qualifications&hl=pt&ie=UTF-8

"There are no constitutional or statutory professional qualifications
to be a justice of the Supreme Court. In practice, all have had legal
training -- legal apprenticeships in our earlier history, law school
in this century. However, one need not have been a judge; John
Marshall was not, nor were Louis Brandeis, Felix Frankfurter, Earl
Warren, William Rehnquist, or many others."
http://partners.is.asu.edu/~george/vacancy/competence.html

"The nine justices of the Supreme Court and other federal judges are
nominated by the president with the advice and consent of the Senate. 
All federal judges and justices of the Supreme court are appointed for
life.  They may be removed from office only through the process of
impeachment."
http://library.thinkquest.org/18802/uslegal.htm

"The Supreme Court consists of the Chief Justice of the United States
and such number of Associate Justices as may be fixed by Congress. The
number of Associate Justices is currently fixed at eight (28 U. S. C.
§1). Power to nominate the Justices is vested in the President of the
United States, and appointments are made with the advice and consent
of the Senate. Article III, §1, of the Constitution further provides
that “[t]he Judges, both of the supreme and inferior Courts, shall
hold their Offices during good Behaviour, and shall, at stated Times,
receive for their Services, a Compensation, which shall not be
diminished during their Continuance in Office."
http://www.supremecourtus.gov/about/briefoverview.pdf

Thank you for the question, and if you need any clarification of my
answer do not hesitate to ask.

Best regards

THX1138

Search strategy included:
federal president "Justice of the us Supreme court" "to be appointed" 
qualifications
://www.google.com/search?hl=pt&ie=ISO-8859-1&as_qdr=all&q=federal+president+%22Justice+of+the+us+Supreme+court%22+%22to+be+appointed%22++qualifications&btnG=Pesquisa+Google&lr=

A good job with amazing turnaround. Many thanks for including the URLs
for the citations.  Well, I lost a bet, but I learned a lot!