A 19-year-old woman believed to be of Maltese descent, Casey Mallia, has succumbed to the injuries she sustained after a car crash on her way to a Christmas holiday with her boyfriend.

Matthew Agius, also 19, was driving their car which overturned as they were on their way from Sydney to stay on a houseboat, according to media reports. He remains in a critical condition.

No other cars were involved in the accident.

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