A recently unsealed affidavit shows Vicky Purdy had been shot in the head in early October.
Her body was found in a burned car on Philpott Road in Franklin County, near the Henry County line.
Police recovered red and brown stains, a digital recorder, a pair of men's blue jeans, and a trunk liner from a car, among other things.
A man told investigators both Purdy and her friend Ricky Dodson came to his home to pick up an "item". The affidavit says neither was seen afterwords.
Dodson's body was found in Franklin County in December.
No arrests have been made in the case.