The 'Gun Dude' and a Supreme Court case that changed who can own firearms in the U.S.

Dick Heller speaks outside the U.S. Supreme Court in Washington, D.C., on June 26, 2008. The Supreme Court case that bears his name redefined gun ownership in America. (Tim Sloan/AFP via Getty Images)

Dick Heller would like to be known as the "Gun Dude."

For the self-described octogenarian who still works as a special police officer in the federal prison system, it's a moniker that acknowledges the key role he has played in how the Second Amendment is interpreted today.