The Forensic Crash Unit is investigating following a serious single-vehicle traffic crash at Sarina on 13 May.
Around 6.15pm, police and emergency services were called to reports that a Toyota Hilux utility lost control and crashed outside a Sarina Homebush Road address.
The 25-year-old male driver sustained minor injuries, while a 29-year-old female passenger sustained life-threatening head injuries.
Both were transported to Mackay Base Hospital for treatment where the woman has since died.
Anyone with relevant information or dashcam footage is urged to contact police.
Investigations are ongoing.
If you have information for police, contact Policelink by providing information using the online suspicious activity form 24hrs per day at www.police.qld.gov.au/reporting or call 131 444.
Report crime information anonymously via Crime Stoppers. Call 1800 333 000 or report online at www.crimestoppersqld.com.au.