Gary Leon Ridgway, also known as the Green River Killer, is an American serial killer. He was initially convicted of 48 separate murders. As part of his plea bargain, another conviction was added, bringing the total number of convictions to 49, making him the second most prolific serial killer in United States history according to confirmed murders. He killed many teenage girls and women in the state of Washington during the 1980s and 1990s.