Queensland Police have confirmed the 31-year-old woman involved in a fatal vehicle fire at Camp Hill in Brisbane has died from her injuries

Hannah Baxter died at the Royal Brisbane and Women's Hospital last night.

Her husband, Rowan Baxter, died alongside their children Laianah, Aaliyah and Trey on a quiet suburban street in Brisbane's east yesterday morning.

Police say it's too early to tell whether it was murder-suicide or an accident, although one witness told News Corp Ms Baxter had run from the car screaming 'he's poured petrol on me."

Rowan Baxter was a member of the New Zealand Warriors NRL squad in the mid-2000s.

The couple had run a Brisbane fitness centre.