But Mr Thornburgh had been at the property for more than a week before he was found dead, the neighbour said.
As well as Boutique, Mr Thornburgh owns the local pub, the Barmah Hotel, in the tiny country Victorian town.
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“Just a little note to say thank you for your services.
Mr Thornburgh was discovered on a mattress on the front porch of his property on Evans St in the town of Barmah, on the Victorian-NSW border, the Age reports.
He had sustained a gunshot wound to the head, according to 7News.
Rachael, who also works as a television reporter, assisted with hosting duties during the event and spoke with one special attendee .
Authorities are treating the death as suspicious and a post-mortem examination is expected to be completed by Tuesday afternoon, the spokesman added.
Last year, detectives were investigating whether an organised crime gang chasing the repayment of debts was responsible for a drive-by shooting at Mr Thornburgh's ex-wife's home.
The property in affluent Port Melbourne was shot at in the early hours of the morning in October 2016.
She enhanced her eye-catching look with a wide-brimmed hat by Nerida Winter, Tony Bianco strappy sandals and a beige-toned minaudiere.
Rebecca, 26, went for a demure look in a knee-length, blush pink Demkiw dress accentuating her statuesque frame.