Decades of investigation · DNA identification · 49 convictions
Gary Ridgway was identified as a suspect early, but preserved biological evidence and improved DNA testing were needed to connect him to the murders nearly two decades later.
The Green River killings were a long-running series of murders in Washington state in which dozens of women and girls were abducted, killed, and left at dump sites across King County and surrounding areas. After nearly two decades of investigation, DNA evidence led authorities to Gary Ridgway, who pleaded guilty to 48 murders in 2003 and later admitted to additional killings.
The victims
Lives recovered from a case defined by scale
The scale
Key figures are drawn from the published case record.
The investigative arc
Police first encountered Ridgway in 1983. The decisive break arrived when improved DNA testing connected preserved evidence to him nearly two decades later.
See all 8 mapped locations →Jul 15, 1982
The body of Wendy Lee Coffield, 16, is discovered in the Green River. Within a month, the bodies of Debra Lynn Bonner, Marcia Faye Chapman, Opal Charmaine Mills, and Cynthia Jean Hinds are also found, confirming a serial killer is operating.
Aug 16, 1982
The King County Sheriff's Office officially forms the Green River Task Force to investigate the growing number of murders, initiating one of the longest and most expensive homicide investigations in U.S. history.
Apr 30, 1983
Gary Ridgway is first contacted by police after the disappearance of Marie Malvar. Her boyfriend reports seeing her get into a pickup truck traced back to Ridgway. He is interviewed, denies involvement, and passes a polygraph test in May 1984.
Sep 1, 2001
Advances in DNA technology allow investigators to re-examine evidence collected in 1987. Semen samples from multiple victims are conclusively matched to the DNA profile collected from Gary Ridgway.
Nov 30, 2001
Gary Ridgway is arrested at the Kenworth truck factory where he works in Renton, Washington, based on the new DNA evidence linking him to four murders.
Nov 5, 2003
To avoid the death penalty, Ridgway agrees to a plea deal. He pleads guilty to 48 counts of aggravated first-degree murder and agrees to cooperate by confessing to dozens of murders and leading investigators to the remains of his undiscovered victims.
How the case closed
The task force retained biological evidence long enough for later DNA methods to produce a conclusive match.
The DNA match linked Ridgway to multiple victims independently of his later confessions.
The plea agreement converted that forensic case into 48 admissions while requiring cooperation on additional victims.
The first cluster of discoveries along the Green River established the case, while later dump sites showed a much wider geography.
Explore the case imagery →Where certainty changes
Open each layer to see what the archive treats as core, contested, or unresolved.
Go deeper
This overview is the map. The case tabs hold the underlying events, people, media, locations, and source material.