Baltimore police have identified 'Woodlawn Jane Doe' from a 1976 cold case as Margaret Fetterolf of Alexandria, Va. Fetterolf ran away from home in 1975 and her family had not heard from her since After 45 years, police have determined the identity of 'Woodlawn Jane Doe,' a woman who was found on the side of the road near a cemetery in Woodlawn, Maryland. On Thursday, Baltimore police identified the woman as 16-year-old, Margaret Fetterolf of Alexandria, Virginia. Investigators used familial DNA and genealogy sites, such as Ancestry.com, to connect Fetterolf to the 1976 cold case, the Baltimore Sun reported. Fetterolf's body was found on September 12, 1976 after having been strangled and sexually assaulted. She also had sedative and antipsychotic drug Chlorpromazine in her system. Police say knowing Woodlawn Jane Doe's identity brings them one step closer to finding her killer. 'This is so significant. This is a really big break in the case,' Baltimore County Police Cpl. Dona Carter said. 'Because without knowing who she is or where she came from, we really don't have too much to go on. We need to know who she may have been with to get some leads for this case.' Fetterolf's body was found left on the side of the road near a cemetery in Woodlawn, Maryland on Sept. 12, 1976. Investigators believe she was drugged, sexually assaulted, and strangled Baltimore County officers will be heading to Alexandria in attempt to further their investigation. Carter said they will be visiting Hayfield Secondary School, where Fetterolf attended at the time, and have interest in speaking with her former friends and classmates. A police sketch of 'Woodlawn Jane Doe' 'We are interested in speaking with some of her classmates who may have known her, anybody that may have been friends with her, that could provide some information that led up to her death,' Carter said. Police hope to learn more about the final months of her life. Fetterolf's brother, Edward Fetterolf, told local TV station WCVB that his sister was a 'habitual runaway,' noting that the last time he saw her was when she ran away from home in 1975. Edward said the family never knew why Fetterolf didn't contact them. 'I kind of had always suspected the worst,' he said. '[Police] showed me a picture and I immediately knew it was her. It was a surprise after the length of time and after there was no news at all for so long.' Edward added: 'In my eyes, she never grew up. So I remember her from when she ran away the last time.' Fetterolf was found dead on September 12, 1976 with an unidentified man's DNA was left on her body, leading police to think she was sexually assaulted. She was also found with her neck and hands tied up. Her face was covered with a yellow seed bag stamped with an address from Waltham, Massachusetts, and two keys found in her pocket were made in Fitchburg, about 50 miles outside of Boston. Fetterolf was found with a leather necklace (left), a tattoo of the letters 'JP' on her shoulder, and two brass keys made in Fitchburg, Massachusetts (right). Recent pollen samples taken from her narrowed down her location to the Arnold Arboretum of Harvard University This lawn seed bag was wrapped around her head, and the Waltham, Massachusetts, stamp was one of the initial clues the victim had ties to the New England state A tattoo of the letters 'JP' on her shoulder was also thought to stand for 'Jamaica Plain,' a neighborhood of the capital city. In 2015, a high-tech pollen revealed a unique blend of cedar and mountain hemlock trees, which are only found together in two locations in the country, on her clothing. The analysis pointed to either the New York Botanical Garden in the Bronx or the Arnold Arboretum of Harvard University, between the neighborhoods of Jamaica Plain and Roslindale. For years, as a result of the pollen evidence and other clues found at the scene, police believed 'Woodlawn Jane Doe' hailed from the Boston area. 'It was only recently Virginia became an area of interest,' police spokeswoman Joy Stewart told the Baltimore Sun. Anyone with information about the case is asked to contact Baltimore County detectives at 410-307-2020. All rights reserved for this news site (dailymail) and under his responsibility