In an interview with the New Zealand website, Stuff, Mr Lewis claimed that Christopher John Lewis, then 17, fired at the Queen as she alighted her motorcade to greet a crowd gathered at the Otago Museum Reserve.
Aside from a brief moment of confusion, the crowd and the Queen continued as normal and the New Zealand police began a cover up that would bury any and all of the evidence.
He later confirmed the teenager's original statement had been destroyed.
Murray Hanan, Lewis's former lawyer, said police did not want to press ahead with a charge of treason - which in 1981 still carried the death penalty - and he believed they had received an order from "up-top, politically" to hush up the attempted murder.
He said: 'The fact an attempted assassination of the Queen had taken place in New Zealand.it was too politically hot to handle. "I think the government took the view that he is a bit nutty and has had a hard upbringing, so it won't be too harsh".
When Lewis faced court, his potshot at the Queen was downgraded to possession of a firearm in a public place and discharging it.
Later, under questioning, another narrative emerged.
The police later changed the story to a fire cracker being let off.
The Queen was nearly assassinated by a teenager during a state visit to New Zealand in 1981, a new report has revealed.
They told press the sound of a gunshot was a council sign falling over.
The young man said he had been ordered to kill the Queen by an Englishman known as "the Snowman" - of who he was immensely scared.
Lewis attempted to write an autobiography called "Last Words" in which he unmasked the alleged cover up of his deed.
Snowman allegedly told Lewis about the far-right movement that was beginning to get momentum in New Zealand, leading Lewis to begin to fantasise about leading his own local terrorist cell.
They described him as looking like something out of a boy scout manual and they later questioned him eight times about the assassination attempt.
By the time he attempted to kill the queen he had a record for armed robbery, arson and animal cruelty.
His idols included Australian bandit Ned Kelly as well as cult leader Charles Manson - who ordered the murders of American actress and model Sharon Tate.
According to the police officer who was originally assigned to the case, Tom Lewis, the orders came from the prime minister at the time, Robert Muldoon, as he was terrified that the Royals would refuse to visit if they found out about the plot to murder Her Majesty.
Two years later Lewis attempted to break free from a psychiatric ward when Prince Charle and Princess Diana and their young son, William visited the country.
Written on the map were the words "Operation = Ass QUEB" - assumed to to be the name he had given his "mission". In 1995, he was said to have been sent to Great Barrier Island in the Hauraki Gulf after authorities grew concerned he would try to assassinate the Queen prior to a meeting of the heads of the Commonwealth Government in Auckland.
They thought it safer to have him idling on a beach far from trouble.
Lewis, however, was not under surveillance during this period.
Lewis was imprisoned in Mt Eden Prison to await trial, but he committed suicide in his cell in 1997 at the age of 33.