An 88-year-old Maryland man with a long history of ties to white supremacist groups is the suspect in Wednesday's fatal shooting at the U.S. Holocaust Memorial Museum, two law enforcement officials told CNN.
James W. von Brunn served six years in prison for trying to make what he called a "legal, non-violent citizens arrest" of Federal Reserve Board members in 1981 -- a prison term he blamed on "a Negro jury, Jew/Negro attorneys" and "a Jew judge," he said on his Web site, Holy Western Empire.
"He is in our files going back way into the 1980s," said Heidi Beirich, a researcher for the Southern Poverty Law Center, based in Montgomery, Alabama. "He has an extremely long history with neo-Nazis and white supremacists. He's written extremely incendiary publications, raging about Jews, blacks and the like." 
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CNN's Bill Mears and Steve Turnham contributed to this report.
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