But the greying 67-year-old is far from being the household name that he became after shooting and wounding the 40th US president - and several others - outside a Washington hotel. Today, historians say Hinckley is at best a question on a quiz show and someone who unintentionally helped build the Reagan legend and inspire a push for stricter gun control.
"If Hinckley had succeeded in killing Reagan, then he would have been a pivotal historical figure," HW Brands, a historian and Reagan biographer, wrote in an email to The Associated Press. "As it is, he is a misguided soul whom history has already forgotten."
Barbara A Perry, a professor and director of presidential studies at the University of Virginia's Miller Centre, said that Hinckley "would be maybe a Jeopardy question".
But his impact remains tangible in Reagan's legacy.
"For the president himself to have been so seriously wounded, and to come back from that - that actually made Ronald Reagan the legend that he became ... like the movie hero that he was," Perry said.
Friedman, the federal judge overseeing Hinckley's case, said on June 1 that Hinckley has shown no signs of active mental illness since the mid-1980s and has exhibited no violent behaviour or interest in weapons.
"I am confident that Mr Hinckley will do well in the years remaining to him," the judge said during the hearing earlier this month.
He noted that lawyers for the government and Hinckley have fought for years over whether Hinckley should be given increasing amounts of freedom.
"It took us a long time to get here," he said, adding that there is now unanimous agreement: "This is the time to let John Hinckley move on with his life, so we will."
