Mason Lee.
Mason Lee. Contributed

Mason Lee's mum: 'Child killer, you're a child killer'

THE mother of toddler Mason Lee had to be dragged out of court after the magistrate adjourned for lunch after she screamed "child killer, you're a child killer" and lunged towards the toddler's stepfather in the dock.

Anne Maree Lee loudly sobbed in court this morning as she heard evidence of the horrific injuries that led to the 21-month-old's death last year.

Mason died at his Caboolture home last June after allegedly suffering multiple injuries including a ruptured intestine, which led to sepsis.

It is alleged Lee, stepfather William Andrew O'Sullivan and a teenager living at the home, Ryan Hodson, failed to provide the boy with the medical treatment he desperately needed.

All three are charged with manslaughter, while O'Sullivan and Lee also face a charge of child cruelty.

A committal hearing began in the Brisbane Magistrates Court this morning and the first witness was Queensland Health pathologist Dr Christopher Day.

Dr Day said it was his opinion that the original injury to Mason's abdomen was caused by blunt-force trauma, which ruptured his intestine and caused a laceration to his bowel.

He said it could have been a blow or "squeezing" that forced the child's bowel against his backbone.

Lee, who is in the dock with her co-accused flanked by prison guards, cried out and sobbed as the evidence was heard.

Lee had to be warned to stay quiet or be removed from the courtroom after she leapt out of her chair and shouted.

"What did you do to my son! You killed my son!," she screamed as prison guards struggled to force her back in her seat.

It is unclear if she was yelling at O'Sullivan or Hodson.

Magistrate Anne Thacker briefly stopped proceedings to issue a warning.

"You have to stay quiet or you'll be removed," she said.

Dr Day was asked if a child with a ruptured intestine would have an appetite in the lead-up to death.

"I believe that the potential signs and symptoms would be variable. It is difficult to say what would have occurred from child to child," he replied.

The hearing is expected to run for two days and evidence will be heard from 13 witnesses.

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