Home and Away actor Jessica Falkholt remains in a critical condition more than a day after her life support was turned off.

A spokesperson for St George Hospital confirmed the 29-year-old's status Saturday morning.

Falkholt was badly injured on Boxing Day in a horror head-on car crash, which also claimed the lives of her younger sister Annabelle, 21, and parents Lars, 69, and Vivian, 60.

The parents died at the scene, but Annabelle died three days later after having been pulled from the fiery wreckage with her sister near Ulladulla on the NSW south coast.

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The crash also claimed the life of the other car's driver, Craig Whitehall, 50, who has been exposed as a serial traffic offender.