Poisoned for $100k: mother on trial for son's death

A Brisbane Supreme Court has heard opening arguments in a case that illustrates the intersecting pressures of family dysfunction, mental health crisis, and financial desperation — with a 26-year-old man dead and his mother accused of orchestrating his death through poisoning.

Maree Mavis Crabtree, 57, pleaded not guilty this week to murder, attempted murder, and attempted insurance fraud in connection with her son Jonathan's death. Jonathan was found at the family home north of the Gold Coast in mid-2017 with an excessive amount of prescription oxycodone in his system — enough to kill him.

The prosecutor's case rests on three alleged motives, each quantifiable and interconnected. The primary financial incentive: Jonathan's $100,000 disability insurance payout, which prosecutors say Crabtree sought to access. A secondary financial fear: her son's alleged armed robbery of a chemist years earlier, which she believed threatened the family home with lawsuits. And a third, more visceral motive: relief from the burden of caring for a dependent adult son whose brain injury from a car crash had left him with aggressive, difficult behaviour.

Prosecutors told the court that Crabtree deliberately mixed oxycodone into a drink to administer a fatal dose. They point to alleged evidence of planning: a comment to a family friend in early 2017 — "Jonathan is like a potato, he has no life and I just want to put something in his drink so he just won't be here" — and an alleged prior attempt six months before his death, on 10 January 2017, using the same method.

The prosecution's strongest evidence comes from Jonathan's younger sister, Tara, who prosecutors claim not only witnessed her mother's plan but actively participated — standing lookout while Crabtree mixed the drink and allegedly hearing her brother struggle to breathe during the night after he consumed it.

The defence attacks the credibility of this single linchpin. Tara's story, they argue, emerged two years after Jonathan's death, creating doubt about its reliability. They suggest Jonathan, given his documented addiction to prescription medication, depression, and a suicide attempt in 2015, may have accidentally or deliberately overdosed himself. Defence counsel portrayed prosecutors as having "cherry picked" Crabtree's statements about her son's violent behaviour rather than considering the full context of a family in crisis.

Jonathan's circumstances emerge as a backdrop to both prosecution and defence arguments. A car crash had caused a brain injury that left him dependent, aggressive, and requiring significant physical care. He used drugs, took "anything he can get his hands on," according to Crabtree's own police statements, and had attempted suicide.

The case will unfold over three weeks before Justice Peter Davis as the jury decides: did a desperate mother poison her troubled son, or did a man struggling with addiction and mental illness die by his own hand or accident?