Hotel mix-up could overturn mushroom murderer's conviction

In July 2025, as elite table tennis players gathered in Australia's Gippsland region for the national championships, the jury deliberating one of the country's most notorious murder cases was supposed to be sealed off from the world. Instead, they were sharing a hotel with the prosecution team, the lead detective, and journalists covering the trial—a collision of circumstances that Erin Patterson's lawyers now argue has poisoned the entire verdict.

Patterson, convicted of killing three people and gravely injuring a fourth by serving them a poisoned mushroom lunch in 2023, was sentenced to life imprisonment. The crime had gripped the region. Korumburra, where the victims were known and loved, descended into grief. Leongatha, Patterson's home, reeled in shock. Morwell, where the trial took place, was overrun with lawyers, journalists, and spectators. The trial judge, Justice Christopher Beale, decided the only way to protect the jury from contamination was to sequester them—a rare and drastic measure that would keep them isolated in supervised accommodation with minimal outside contact until they reached their verdicts.

But the logistics proved impossible. As the trial stretched longer than anyone anticipated, finding rooms for twelve jurors and their keepers became an escalating scramble. Then the table tennis tournament arrived, and the accommodation crisis became acute. The week the jury finally retired to deliberate was the same week hundreds of competitors descended on the region seeking hotel rooms. On the morning of Monday, July 7, an email from the judge's chambers revealed the problem: the lead detective who had investigated the murders—a crucial prosecution witness—and two prosecution solicitors had been staying at the same hotel as the sequestered jury.

The jury had occupied a separate floor with exclusive access, and they ate their meals in a conference room away from other guests. The jury keeper reported no interaction had occurred. Justice Beale acknowledged the situation was "obviously undesirable" but noted the precautions taken. The prosecution admitted they had known about the overlap for days and had attempted to relocate staff but couldn't find alternative rooms for two solicitors. Both the detective and the solicitors, they said, had taken steps to avoid common areas. Within hours, however, the jury announced their verdicts: guilty on all counts. The hotel mix-up was overshadowed by the guilty verdict itself.

Now, more than a year later, Patterson's legal team is arguing that this procedural failure was catastrophic enough to warrant a complete retrial. Richard Edney, her appeal counsel, told Victoria's Court of Appeal this week that the situation amounted to a "fundamental irregularity" that "fatally undermined" the integrity of the trial. The defence had been kept in the dark about the hotel situation for several days longer than the prosecution and the judge. When they later requested investigations from the state's juries commissioner, both requests were rejected without public explanation. What remains, Edney argued, is a "vacuum of evidence"—no hotel security footage, no sworn statements from those who shared the building with the jury, nothing but two brief emails from July.

Edney pointed to precedent cases where far smaller irregularities had led to retrials: one in which a juror was offered a throat lozenge by a defendant's relative during a coughing fit, another in which jurors took an unescorted taxi. He argued that even innocent contact—merely seeing the detective or solicitors—could have created "subconscious influence" on the jury's deliberations. "This was a hotel with windows," he said repeatedly, suggesting visibility alone could have tainted the process. He invoked the trial judge's own words from jury selection: "Justice must not only be done, it must be seen to be done."

The prosecution's response was direct. Director of Public Prosecutions Brendan Kissane KC argued that the system worked exactly as intended. The jury was under constant supervision. When a potential problem was identified, steps were taken immediately to prevent it from becoming an actual problem. The jury keeper, the detective, and the prosecution all maintained there was no contact. Justice Peter Kidd questioned whether mere proximity mattered: jurors see other parties all the time in corridors and cafes, he noted, yet they remain under supervision. The prosecution pointed out that in every precedent case the defence cited, there was actual evidence of contact between jurors and outside parties. Here, there was none.

Patterson has seven grounds for appeal, but this one—the hotel mix-up—is unprecedented in Australian law. The three judges of the Court of Appeal are now deliberating not only whether the procedural irregularity justifies overturning her convictions, but also a separate prosecution argument that her parole period should be scrapped. Their decision will determine whether a table tennis tournament and a shortage of hotel rooms can unravel a murder conviction, or whether the safeguards around jury supervision held firm despite the chaos.