When did the Green River killer stop murdering people?

Answer 1

According to Ridgeway himself in his 2003 confession after his arrest, Patricia Yellowrobe, who disappeared in 1998, was his last victim. This may or may not be the truth. Actually, Ridgeway had killed so many women over such a long period of time (2 decades) that even he could not recall all of them.

Anitra Mulwee went missing December 31, 2000, and was later found in the Green River. It is possible she could have been a victim but there is no way to tell. Likewise with 49 year old Sharon Engelhart, who disappeared in February 2001, and she too, was found later in the Green River.

Another possiblity is that there was a later, second killer that dumped the bodies in the Green River to lay blame on the Green River killer. Unless Ridgeway says for sure one way or another, the truth may be lost to history.