Premise: Gary Leon Ridgway ( born February 18 , 1949 ) is an American serial killer known as the Green River Killer . As part of his plea bargain , an additional conviction was added , bringing the total number of convictions to 49 , making him the most prolific American serial killer in history according to confirmed murders . He murdered numerous women and girls in Washington State during the 1980s and 1990s .
Hypothesis: Gary Ridgway murdered people.
Label: ENTAILMENT