Police are appealing for witnesses and dashcam footage following a four-car collision near Claverton on Saturday 15 April.
Emergency services were called to the A36 Warminster Road at approximately 9.15pm shortly after the incident.
Seven people sustained an injury, some of which required hospital treatment. Sadly, one woman died in hospital on Sunday 16 April.
The vehicles involved were a white Ford Puma, blue BMW and two Ford Fiestas, one grey and the other blue.
The road was shut for a number of hours but the road closure was lifted later.
Enquiries were carried out at the scene by officers and police have asked any witnesses or any drivers in the area at the time and may have relevant dashcam footage, to call 101 and quote reference number 5223087300.