Prince George's County police sent the 19-year-old woman's femur to a lab in Virginia for DNA testing.
Last year, 79-year-old Samuel Little sketched a drawing of the young woman he says he killed, but she remains unidentified.
Little and the woman are believed to have met at a Greyhound bus station on New York Avenue in Washington, D.C., in May or June 1972. Over a three-day period, Little and the woman had interactions and at one point, left the station in Little's car, Little told authorities. They drove on what investigators believe was the Baltimore-Washington Parkway, left the parkway in the area of Beltsville, Maryland, and had sex, Little told authorities. He then strangled the victim, he said.
The woman's remains were found in December of that year by a hunter who was walking through a wooded area. A medical examiner concluded that the remains had been there for about six months.
Little was in the D.C. area at the time of the killing and was arrested on a handgun charge in May 1972 at the same bus station where he said he met the victim.
She may have been from the Massachusetts area and had recently gotten divorced, Little told investigators. Her height was between 5-foot-2 and 5-foot-6. She was Caucasian and may have had a child.
Little told investigators that the Prince George's County victim was his only victim in the Washington, D.C., area.
Bone of Unidentified Victim of Serial Killer Gets DNA Tests