The first trial in 1995 was a shambles, marked in part by the chaos Eastman himself brought upon it. As the trial judge remarked at the time, Eastman had committed forensic suicide, dooming himself to conviction. A judicial inquiry nearly 20 years later found there had been a substantial miscarriage of justice. Acting Justice Brian Martin declared a retrial would neither be feasible, nor fair.

He made that conclusion and another - that while he was almost certain of Eastman's guilt, he retained a nagging doubt. The 2018 jury also had a doubt, and on November 22, on their seventh day of deliberations, they returned a unanimous verdict of not guilty to the murder of Australian Federal Police Assistant Commissioner Colin Winchester.

Eastman's temper is infamous, perhaps one explanation for why tension grew around his name as the trial crept closer. There is a long list of people he has offended or physically assaulted, including a fellow student while at university. He once assaulted a female journalist and punched the deputy registrar of the Administrative Appeals Tribunal (he had an assault conviction overturned on appeal on a technicality), and another time crushed a secretary's hand in a door.

In September 1992, Eastman forced staff to wheel him from the court after he refused to move in protest. During the first trial, Eastman routinely attacked his lawyers, in one particularly vitriolic stream of abuse describing one barrister as "this evil, twisted little dwarf".

In fairness to Eastman, it has been a long time since his poor behaviour, or his rage and anger, made headlines. But the courts memory is slow to fade. During the retrial this year the question that was often on the mind of those familiar with his in-court antics was how was the notorious disrupter behaving now?

In the event, the former Treasury official was a model defendant, at least in public. An unexplained turnaround from his former theatrics..

With newfound discipline, he did not sack one lawyer, at odds with the carnage of a case he left behind after sending his defence team packing 11 times during his first. Instead of throwing a jug at a judicial officer, as he did to one magistrate in 1992, he sipped water from a plastic cup. Where he once abused the corrupt shit of a judge and swore at the prosecutor, this time he was silent and restrained. He thanked the jury and judge at the verdict.

Eastmans intemperate actions at the first trial gave way to a studied if never fully relaxed ability to sit back and let his lawyers do the talking this time around. That meant trial number two was professional, smooth, and mostly uneventful.

The 73 year old, in his daily uniform of black sneakers, neat cuffed jeans, pressed collared shirt, and navy sweater, sat placid and alone at the back of the court, each day unpacking a bottle of water and a notebook from a tattered plastic Aldi bag, and jotting on the occasional Post-It note for his lawyers.

Was this almost timid, elderly man the same one who spent 19 years in jail for the brutal murder of a respected police chief?

Eastman - whom one witness described as suffering a persecution complex before the defence objected to the opinion - still had grievances and sought to communicate them, but now it was via a delicate word from a sheriff or lawyer. A complaint about a sniffing journalist in the public gallery, and another about a member of the public sitting too close behind him.

Eastman the accused was emotionally inscrutable but when it came to the evidence his steely gaze did not waver, even when graphic images of Colin Winchesters slain body paused on the screen in front of him. One witness had to be ushered from the room by the sheriffs while complaining loudly about why Eastman was allowed to eyeball him but he couldnt return the favour.

The question about Eastman's behaviour at the first trial was whether he was deliberately acting out to get a retrial on appeal, believing the bad press would mean a second trial would never take place, or whether he was simply out of control, a product of his mental health.

Maybe he was out of luck when the ACT director of public prosecutions in office at the time made the unpopular and unlikely decision to prosecute Eastman for a second time.

The unanswered question now is what tamed him? Was it age and weariness? Treatment of his mental health? Or was it the base fear of being sent back to jail?

When this latest jury was empanelled on June 4, Acting Justice Murray Kellam, a retired member of the Victorian judiciary, told the 500-odd crowd that whoever did not think they could perform their duties as a juror on this case could leave. The tactic must have been effective because the 16 finally chosen were dedicated to the enormous task before them. Their impassive faces would break only to share the occasional joke with the judge or lawyers. They sat patiently for months absorbing the mountains of material before them.

They also became friends. Three months into the trial, the jurors asked whether they could meet socially, outside of courtroom hours. There was talk of a picnic in Tidbinbilla. A diplomatic Acting Justice Kellam let them down gently, while thanking the members for their integrity and honesty.

The jury lost one of their number early on after a member of the public dobbed her in. Despite all his warnings not to talk about the case outside the jury room, a note to the judge from the anonymous citizen suggested the juror had been boasting about her role in the Eastman trial at a local massage joint and about how she had already made up her mind - not guilty.

The juror was dismissed, the remaining members left to guess why. Another juror later fell sick and was also excused.

The jurors to their credit remained attentive until the last moment. When it came time for the ballot and for the jury to be whittled down from the remaining 14 to 12, in a sad moment, one of the more studious jurors was selected to leave. She shook her head in bitter disbelief.

October 11 was the last day the trial was to sit in the old Supreme Court building and a constant buzzing noise gave one juror a headache. It could not be fixed and the other jury courtroom was just as bad. The old building seemed to have given up so the judge abandoned the days work and sent everyone home for an extra long weekend.

On October 15, the trial moved into the new court room. It was fitting that Eastman, whose history is intertwined with the ACT Supreme and Magistrates Court, should also appear as defendant in the new building.

There were many reasons not to hold a retrial after the first miscarried, damaged irreparably by deeply flawed forensic evidence. There was the exorbitant cost to the taxpayer, Eastmans age (he turned 73 during the trial) and the time since Winchester's murder, to name a few.

Acting Justice Martin, the head of a judicial inquiry that found Eastmans 1995 conviction should be quashed, considered a retrial would be both unfeasible and unfair.

Who would convict him? Would a judge jail him again if so?

Ageing witnesses or those dead or unable to attend court became a feature of Eastmans fresh trial. There were 127 live witnesses for the prosecution and a further 41 pieces of evidence from those unable to take the stand.

For those unable to attend, their police statements, or transcripts of their evidence at the first trial or the inquest were read out by two prosecutors in a deadpan role play, neither daring to put their own inflections on the evidence.

Some witnesses were more frail than the last time they gave evidence in the trial of Eastman. Some entered court with the help of a walking stick. Others grizzled on the way in and out, or apologised for the aches and pains that slowed their movements. Others seemed shocked to be here again while many struggled to recall with precise detail unmemorable everyday events from 30 years ago.

The jury took in mountains of evidence and submissions, more than 5000 pages worth of transcript. But the public will only ever know a portion of why this jury came to the conclusion it did. A veil of secrecy came down on the trial early on.

Closed sessions and various suppression orders knit into a poorly constructed quilt of prohibited communication about various names and incidents tendered during the trial, many detailing the suggestion it was the Mafia behind the killing.

The orders - countless, clouded - will live on in perpetuity unless otherwise ordered, though so too will the names and details of much of what has been suppressed, already on Google or Trove, or books or documentaries. Or in one case, the witness whose name and evidence was detailed - unsuppressed - in Acting Justice Martin's 2014 report.

Before the trial began, the judge partly agreed to an application by the defence to suppress Eastmans image and banned publication of photos of Eastman from before January 2016. This was lifted following the trial.

During the trial, the judge went on to reject the media's request for access to innocuous photographs tendered as exhibits, and another request for a transcript of the barristers closing addresses.

The media's attempt to fact check during the trial with another request to see an exhibit was reluctantly allowed, but only with the defence and Crowns support.

On August 29, still early days, the public was excised from hearing what the Crown said was evidence of Eastman admitting the killing. The court turned silent disco as jury, judge, lawyers, barristers and Eastman placed headphones over their ears to listen to mutterings recorded by police bugs planted in Eastmans flat. The rest - including the media responsible for keeping the public informed - sat in a silent open court.

Requests to the judge for the media to access the recordings were rejected. At the trials end, the media also requested access to a number of exhibits, including the audio of Eastmans alleged confessions. That appears unlikely to happen.

When the trial shifted to the new courtroom, the judge allowed Eastman the luxury of not sitting in the dock for accused people, segregated from the court by a small barrier. He was allowed to sit with his lawyers near the bar table, up until the verdict.

We will likely never know the reasons the jury came to their decision.

This is the constraint of the criminal system. It is illegal for jurors to disclose details of their deliberations. The question now turns to what happens next. Will there be a fight over compensation? It seems likely. Almost certainly, this will not be the last we hear of David Eastman.