I would like to thank every person who has come forward with information following this incident. ... What I am now urging is that anyone who was in this area - especially on the A3102 heading towards Royal Wootton Bassett between 10.30pm and 11pm on Sunday evening, to contact us immediately. The smallest amount of information might prove vital. We believe this woman was struck by a vehicle which has then failed to stop at the scene. It is possible that the driver of this vehicle might not have realised they have hit anything or might have thought they had struck an animal.
The road was closed for 8 hours while officers from the Wiltshire Police Serious Collision Investigation Team investigated the scene.
The Collision Team can be contacted on 101 extension 720 3111 or via Crimestoppers on 0800 555 111 where information can be left anonymously.
More top news
We've been in awe with all the pictures you've been sending us. Here's as many as we can fit!
An exclusive ITV opinion poll shows the Lib Dems are facing electoral wipeout in the South West.
A Somerset photographer has captured a series of striking images showing a cat tussling with a mouse on a roof top.