Miller, also known as Frazier Glenn Cross Jr., testified during his trial that he wanted to kill Jewish people before he died. He said he didn't expect to live long because he had chronic emphysema.
During his trial and at his sentencing, Miller frequently interrupted the proceedings to give rambling statements about his belief that Jewish people were running the government, media and the Federal Reserve.
During his closing arguments at trial, Miller said he had been "floating on a cloud" since the killings. When he was convicted and when he was sentenced to death, Miller raised his arm in the Nazi salute.
Miller was a Vietnam War veteran who founded the Carolina Knights of the Ku Klux Klan in his native North Carolina and later the White Patriot Party. He also ran on a white power platform during campaigns for the U.S. House in 2006 and the U.S. Senate in 2010 in Missouri.
In arguments before the Kansas Supreme Court in March appealing his death sentence, Miller's attorneys argued that he was incapable of understanding the legal intricacies of a complicated death penalty case and should not have been allowed to represent himself, even though he insisted on being his own attorney.
Attorney Reid Nelson said Miller’s standby attorneys should have been allowed to intervene during the penalty phase.
Associated Press writer John Hanna in Topeka, Kansas, contributed to this report.
The story has been corrected to indicate that Miller was also known as Frazier Glenn Cross Jr., not Frazier Glenn Close.