Premise: Gary Leon Ridgway ( born February 18 , 1949 ) is an American serial killer known as the Green River Killer . He was initially convicted of 48 separate murders and later confessed to nearly twice that number . On November 30 , 2001 , as he was leaving the Kenworth truck factory where he worked in Renton , Washington , he was arrested for the murders of four women whose cases were linked to him through DNA evidence .
Hypothesis: Gary Ridgway is a killer.
Label: ENTAILMENT