John Hinckley Jr, who shot and wounded US president Ronald Reagan in 1981, has been freed from court oversight, officially concluding decades of supervision by legal and mental health professionals.

“After 41 years 2 months and 15 days, FREEDOM AT LAST!!!,” he wrote on Twitter shortly after 12pm on Wednesday (US time).

The lifting of all restrictions had been expected since late September.

US District Court Judge Paul L Friedman in Washington DC said he would free Hinckley on June 15 if he continued to remain mentally stable in the community in Virginia where he has lived since 2016.

Hinckley, who was acquitted by reason of insanity, spent the decades before that in a Washington DC mental hospital.

Hinckley’s restrictions were gradually loosened over the years, including the lifting of limits on his social media use.

Hinckley’s following on social media has grown to nearly 30,000 followers on Twitter and YouTube over the past several months.

Freedom for Hinckley will include giving a concert – he plays guitar and sings – in Brooklyn, New York, that is scheduled for July.

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 DC 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 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,” Professor Perry said.

Judge Friedman, the federal judge overseeing Hinckley’s case, said on June 1 that Hinckley had shown no signs of active mental illness since the mid-1980s and had exhibited no violent behaviour or interest in weapons.

“I am confident that Mr Hinckley will do well in the years remaining to him,” he said during the hearing earlier this month.

He noted that lawyers for the government and Hinckley had 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 there was now unanimous agreement: “This is the time to let John Hinckley move on with his life, so we will.”

-AAP