(Newser) – A researcher on the cusp of making "very significant findings" related to the novel coronavirus was shot dead in Pennsylvania over the weekend. Bing Liu of the University of Pittsburgh School of Medicine was killed around noon Saturday inside his home north of Pittsburgh in what authorities describe as a murder-suicide. An hour after the 37-year-old's body was found with gunshot wounds to the head, neck, and torso, the body of another man was found in a car parked about 100 yards away, per NBC News and the Pittsburgh Post-Gazette. Hao Gu, 46—believed to have killed Liu before returning to his car—died of a self-inflicted gunshot wound, officials say. Police are still investigating a potential motive and the relationship between the two men but say they knew each other.