The decision to deny the petition has effectively ended the long and bitter battle over the rights to the iconic DC superhero (via Robot 6).
The 2013 ruling by the Ninth Circuit Court that Shuster's nephew Mark Peavy cannot reclaim the artist's stake in the Superman rights due to a 1992 agreement with DC stands.
The agreement - which included various benefits and a $25,000 annual pension for Shuster's sister Jean Peavy and brother Frank Shuster - was judged to invalidate a 2003 copyright-termination notice filed by Mark Peavy.
Another long-running case between Marvel Comics and the estate of Jack Kirby recently settled out of court after petitions to have it taken before the Supreme Court.
DC famously bought the rights to Superman from the young Shuster and partner Jerry Siegel