Mills was determined to be between the ages of 18 and 25, although possibly as old as 35; this placed her birth between c. 1943 and 1960. Her hair was naturally brown, but was likely dyed blond, as its color was darker toward the roots. The word "Kim" was amateurishly tattooed on her right arm; this was speculated, before her identification, to have been her own or her child's name, as her autopsy concluded that she had borne at least one child. Some of her teeth had yet to erupt. She was shot once in the head with a shotgun. Her possessions included a mercury dime necklace and a multicolored striped shirt and jeans.
