Kiwi man who killed Hannah Clarke, three kids tried to stop witness from extinguishing car he set alight, coroner's court hears

Warning: This article contains details that may disturb some people.

Harrowing accounts of how a Kiwi father killed his estranged wife and three children have been relived in a Queensland coroner's court. 

Witnesses described the last moments as neighbours tried to comfort the mum of three. 

Hannah Clarke would have done anything for her three young children and the day they all died, her final moments prove just that.

Witnesses said through unspeakable pain, she showed unbelievable strength.

"Hannah was incredibly courageous at the scene given the level of her injuries," said Stephen Rashford of the Queensland Ambulance Service.

Clarke had suffered burns to 97 percent of her body. The court heard that witness Samantha Covey tried to keep her conscious and talking. 

Covey was told by Clarke her Kiwi husband Rowan Baxter had hijacked the school run holding a jerry can. They passed a man - Michael Zemek - who was washing his car.

"Hannah was essentially calling out 'call the police, call the police, he's trying to kill me, he's put petrol on me,'" Zemek told the court. 

Zemek then ran over - but the car exploded. When another witness, Kerry Fernandez, tried to extinguish the flames - Baxter tried to stop her. 

"I felt like he was almost guarding the car," Fernandez said.

The children were trapped inside and emergency responders were aware of Clarke's fate.

"She suffered level of injuries that were not survivable but was still conscious," Dr Rashford told reporters outside court.

Clarke's final moments were described in court as heroic and brave. She used her final words to give police a statement - describing in detail exactly what had just happened. 

Her mum Sue will now share the rest of Clarke's story. She'll take the stand to recount the red flags of the abusive relationship that cruelly ended four innocent lives.

"I'm nervous about it but I also want to give Hannah a voice," Sue Clarke said.

Clarke's parents will sit through every day of the coroner's inquest to hear where the system failed their daughter and to work out how to stop it from happening again.

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