Lamara Bell, 25, who lay in a crashed car off the M9 near Stirling for three days, has died, her brother Martin Bell said.
Her partner John Yuill, 28, died in the accident. Police have apologised to their families for the delay in providing help.
Scotland's Justice Secretary Michael Matheson has now launched an urgent review into how the police handle emergency calls.
An urgent review of all police call handling in Scotland has been launched by Scotland's Justice Secretary, following the death of Lamara Bell.
Ms Bell died in hospital today after she spent three days lying in a crashed car next to her dead boyfriend.
Justice Secretary Michael Matheson said "it is essential that answers are found quickly".
He added: “This independent review will provide an accurate picture of capacity and capability at present, and clearly identify any issues so they can be promptly remedied.
"On completion the report will be submitted to Ministers who will consider its recommendations."
Scottish police failed to react to a call over a fatal car crash because the information was not logged on their systems.
An investigation has been launched over fears a couple involved in a fatal road crash may have lain in their car for days.