Megan Hargan, 35, has been charged with murder in the death of her mother and sister in 2017 in McLean, Virginia, police said. (Courtesy of Fairfax County Police) Authorities have charged a woman with killing her mother and sister in McLean, Virginia, in a case that the police initially alleged was a murder-suicide. Megan Hargan, 35, was arrested Friday morning in West Virginia, according to Fairfax County Police. She is interviewed by detectives and the police in Fairfax announced that they would hold a press conference Friday afternoon. In July 2017, Helen Lorena Hargan, 23, and her mother, 63-year-old Pamela Denise Hansen Hargan, were found dead in a Dean Drive home. At that time, the police said that it seemed that Helen Hargan had shot her mother, and then herself.[[[[Alleged murder-suicide leaves two dead women to McLean]It was not immediately known what new evidence had been revealed or what details had changed since then. The bodies were found after police received a call from someone who had said that someone might have been killed in the house. At the time, it was not clear who had called the authorities. The police arrived after being unable to reach anyone inside the house. Hansen Hargan had been working for Lockheed Martin, an aerospace subcontractor, for about 25 years and more recently at SAIC, another large government contractor. .