With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gary Ridgway's DNA linked him to the murders of four women and led to his arrest.
text_B: Gary Leon Ridgway -LRB- born February 18 , 1949 -RRB- is an American serial killer known as the Green River Killer .. American. List of serial killers in the United States. serial killer. serial killer. Green River. Green River ( Duwamish River ). He was initially convicted of 48 separate murders and later confessed to nearly twice that number .. 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 .. American. List of serial killers in the United States. serial killer. serial killer. plea bargain. plea bargain. conviction. conviction. He murdered numerous women and girls in Washington State during the 1980s and 1990s .. Washington. Washington ( state ). Washington State. Washington ( state ). Most of his victims were alleged to be sex workers and other women in vulnerable situations , including underage runaways .. The press gave him his nickname after the first five victims were found in the Green River before his identity was known .. Green River. Green River ( Duwamish River ). He strangled the women , usually by hand but sometimes using ligatures .. strangled. strangling. ligatures. Strangling#Ligature strangulation. After strangling them , he would dump their bodies in forested and overgrown areas in King County , often returning to the dead bodies to have sexual intercourse with them .. dump their bodies. Dump job#Police usage. King County. King County, Washington. dead bodies to have sexual intercourse with them. necrophilia. 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 .. Washington. Washington ( state ). Kenworth. Kenworth. DNA. DNA. As part of a plea bargain wherein he agreed to disclose the locations of still-missing women , he was spared the death penalty and received a sentence of life imprisonment without parole .. plea bargain. plea bargain. death penalty. Capital punishment. life imprisonment without parole. life imprisonment in the United States
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