Final answer:
Gary Ridgway, the Green River Killer, was convicted of killing 49 women, but he confessed to killing 71 women in total.
Step-by-step explanation:
Gary Ridgway, the Green River Killer, was convicted of killing 49 women, but he confessed to killing 71 women in total. The question 'How many women did the Green River killer kill?' refers to the actions of Gary Ridgway, known as the Green River Killer, who was convicted of killing 49 women but confessed to killing as many as 71.
The investigation into his crimes spanned many years, and it is one of the most notorious serial killer cases in United States history.