Question: What crime is Gary Ridgway associated with? 

Context paragraphs:
Green River Killer (film): Green River Killer is a 2005 American crime film by Ulli Lommel starring George Kiseleff, Jaquelyn Aurora (as Jacquelyn Horrell), Georgina Donovan, Shannon Leade, Naidra Dawn Thomson, and Shawn G. Smith.  It is based upon the crimes of serial killer Gary Ridgway.

Meleager of Skopas: The "Meleager" of Skopas is a lost bronze sculpture of the Greek hero Meleager – host of the Calydonian boar hunt – that is associated in modern times with the fourth century BCE architect and sculptor Skopas of Paros.  The sculpture escaped mention in any classical writer.  It is judged to have been a late work in the sculptor's career, but it is known only through a number of copies that vary in quality and in fidelity to the original, which show it to have been one of the famous sculptures of antiquity: "the popularity of the Meleager during Roman times was certainly great," notes Brunilde Sismondo Ridgway, who reports Andrew F. Stewart's count of 13 statues, 4 torsos, 19 heads (which are similar enough to the Ludovisi Ares to raise confusions) busts and herms, a variant with changed stance and attributes, and 11 versions adapted for a portrait or a deity.  Six or seven of the accepted copies are accompanied by a dog, 12 wear a chlamys, 3, clinching the sculptural type's identification with Meleager, are accompanied by a boar's head trophy, as in the Vatican "Meleager" ("illustration, right").  Ms Ridgeway accounts for the sculpture's popularity in part "by the appeal that hunting figures had for the Romans, through their heroizing connotations."

Murder of Tammy Vincent: Tammy A. Vincent was an American teenager who was murdered in September 1979.  Her body was not identified until 2007, twenty-eight years after her death.  Despite the fact that her identity was discovered, the case remains unsolved, although a prime suspect has been selected.  It was believed she may have been a victim of the notorious Green River killings, which have an approximate number of 49 victims while she remained a missing person.  Gary Ridgway has since pleaded guilty to most of these killings, plus six additional murders.  However, Vincent's case has not been officially solved. " NCIS" cast member Pauley Perrette collaborated with the popular television show "America's Most Wanted" in 2009 to work on solving the case.

Mark Prothero: Mark Wayne Prothero (1956 – April 19, 2014) was an American attorney in Kent, Washington.  He was best known for serving as defense co-counsel for the Green River Killer, serial killer Gary Ridgway from 2001 to 2003.

Homicide Investigation Tracking System: Homicide Investigation Tracking System (HITS) is a violent crime database program of the Washington State Office of the Attorney General.  The system tracks homicides and rapes in and/or relating to the states of Washington and Oregon and also receives data from at least three other states and Canada.  The database provides information on over 6,000 murders and over 7,000 sexual assaults to local law enforcement agencies as well as advice and assistance in ongoing investigations.  Notable cases that have been assisted by HITS include Gary Ridgway (also known as the Green River Killer), John Allen Muhammad and Lee Boyd Malvo (the Beltway snipers), and serial killer Robert Lee Yates.

Sex Workers Outreach Project USA: Sex Workers Outreach Project-USA (SWOP-USA) is a national social justice network dedicated to the fundamental human rights of sex workers and their communities, focusing on ending violence and stigma through education and advocacy.  The organization was founded by Robyn Few on August 13, 2003, and their first major action was to organize the first annual International Day to End Violence Against Sex Workers (December 17) with the Green River Memorial for the victims of Gary Ridgway, the "Green River Killer."

Robert D. Keppel: Robert David Keppel (born 15 June 1944) is a retired American law enforcement officer and detective best known for his work investigating serial killers Ted Bundy and Gary Ridgway.

Crime scene: A crime scene is any location that may be associated with a committed crime.  Crime scenes contain physical evidence that is pertinent to a criminal investigation.This evidence is collected by crime scene investigators (CSIs) and Law enforcement. The location of a crime scene can be the place where the crime took place, or can be any area that contains evidence from the crime itself.  Scenes are not only limited to a location, but can be any person, place, or object associated with the criminal behaviors that occurred.

Master of Brutality: Master of Brutality is the debut album by the Japanese stoner rock/doom metal band Church of Misery.  Five of the six tracks are based on and titled after infamous serial killers, Edmund Kemper, Peter Sutcliffe, Herbert Mullin, and John Wayne Gacy (portrayed on the cover).  The instrumental track "Green River" is inspired by serial killer Gary Ridgway.  The first track "Killifornia" contains audio of spoken words by Ed Kemper.  The artwork and booklet contains pictures and sketches of John Wayne Gacy; the back art has John Gacy dressed as "Pogo the Clown".

Gary Ridgway: 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 is presumed to be responsible for more than 90.  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.

Supporting paragraphs: Sex Workers Outreach Project USA Gary Ridgway
Answer: He murdered numerous women and girls in Washington State during the 1980s and 1990s.