Gail Mathews

Ridgway was placed in solitary confinement at Washington State Penitentiary in Walla Walla in January 2004. On May 14, 2015, he was transferred to the USP Florence High, a high-security federal prison east of Cañon City, Colorado. In September 2015, after a public outcry and discussions with Governor Jay Inslee, Corrections Secretary Bernie Warner announced that Ridgway would be transferred back to Washington to be "easily accessible" for open murder investigations. Ridgway was returned by chartered plane to Washington State Penitentiary in Walla Walla from the High Security Federal Prison in Florence, Colorado, on October 24, 2015.

Ridgway is suspected of — but not charged with — murdering the remaining six victims of the original list attributed to the Green River Killer. In each case, either Ridgway did not confess to the victim's death, or authorities have not been able to corroborate their suspicion with reliable evidence.

On November 23, 2005, the Associated Press reported that a weekend hiker found the skull of one of the 48 women Ridgway admitted murdering in his 2003 plea bargain with King County prosecutors. The skull of another victim, Tracy Winston, who was 19 when she disappeared from Northgate Mall on September 12, 1983, was found on November 20, 2005 by a man hiking in a wooded area near Highway 18 near Issaquah, southeast of Seattle.

Ridgway confessed to more confirmed murders than any other American serial killer. Over a period of five months of police and prosecutor interviews, he confessed to 48 murders — 42 of which were on the police's list of probable Green River Killer victims. On February 9, 2004, county prosecutors began to release the videotape records of Ridgway's confessions. In one taped interview, he initially told investigators that he was responsible for the deaths of 65 women. In another taped interview with Reichert on December 31, 2003, Ridgway claimed to have murdered 71 victims and confessed to having had sex with them before killing them, a detail which he did not reveal until after his sentencing.

Early in August 2003, Seattle television news reported that Ridgway had been moved from a maximum security cell at King County Jail to an Airway Heights Minimum-Medium Security Level Tank. Other news reports stated that his lawyers, led by Anthony Savage, were closing a plea bargain that would spare him the death penalty in return for his confession to a number of the Green River murders.

On November 5, 2003, Ridgway entered a guilty plea to 48 charges of aggravated first degree murder as part of a plea bargain, agreed to in June, that would spare him execution in exchange for his cooperation in locating the remains of his victims and providing other details. In his statement accompanying his guilty plea, Ridgway explained that he had killed all of his victims inside King County, Washington, and that he had transported and dumped the remains of the two women near Portland to confuse the police.

On December 18, 2003, King County Superior Court Judge Richard Jones sentenced Ridgway to 48 life sentences with no possibility of parole and one life sentence, to be served consecutively. He was also sentenced to an additional 10 years for tampering with evidence for each of the 48 victims, adding 480 years to his 48 life sentences.

Ridgway led prosecutors to three bodies in 2003. On August 16 of that year, the remains of a 16-year-old girl found near Enumclaw, Washington, 40 feet from State Route 410, were pronounced as belonging to Pammy Annette Avent, who had been believed to be a victim of the Green River Killer. The remains of Marie Malvar and April Buttram were found in September 2003.

At the time of Ridgway's December 18, 2003 sentencing, authorities had been able to find at least 48 sets of remains, including victims not originally attributed to the Green River Killer. Ridgway was sentenced for the deaths of each of these 48 victims, with a plea agreement that he would "plead guilty to any and all future cases (in King County) where his confession could be corroborated by reliable evidence."

On November 30, 2001, as Ridgway 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. 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.

The samples collected in 1987 were later subjected to a DNA analysis, providing the evidence for his arrest warrant. On November 30, 2001, Ridgway was at the Kenworth truck factory, where he worked as a spray painter, when police arrived to arrest him. Ridgway was arrested on suspicion of murdering four women nearly 20 years earlier after first being identified as a potential suspect, when DNA evidence conclusively linked semen left in the victims to the saliva swab taken by the police. The four victims named in the original indictment were Marcia Chapman, Opal Mills, Cynthia Hinds, and Carol Ann Christensen. Three more victims — Wendy Coffield, Debra Bonner, and Debra Estes — were added to the indictment after a forensic scientist identified microscopic spray paint spheres as a specific brand and composition of paint used at the Kenworth factory during the specific time frame when these victims were killed.

Ridgway was arrested in 1982 and 2001 on charges related to prostitution. He became a suspect in the Green River killings in 1983. In 1984, Ridgway passed a polygraph test. On April 7, 1987, police took hair and saliva samples from Ridgway.

Around 1985, Ridgway began dating Judith Mawson, who became his third wife in 1988. Mawson claimed in a 2010 television interview that when she moved into his house while they were dating, there was no carpet. Detectives later told her he had probably wrapped a body in the carpet. In the same interview, she described how he would leave for work early in the morning some days, ostensibly for the overtime pay. Mawson speculated that he must have committed some of the murders while supposedly working these early morning shifts. She claimed that she had not suspected Ridgway's crimes before she was contacted by authorities in 1987, and had not even heard of the Green River Killer before that time because she did not watch the news.

Throughout the 1980s and 1990s, Ridgway is believed to have murdered at least 71 teenage girls and women near Seattle and Tacoma, Washington. In court statements, he later reported that he had killed so many that he lost count. A majority of the murders occurred between 1982 and 1984. The victims were believed to be either sex workers or runaways, whom he picked up along Pacific Highway South. Ridgway sometimes showed the women a picture of his son, to trick them into trusting him. They would engage in sexual activity and after minutes of intercourse from behind, Ridgway would wrap his forearm around the front of their necks and use the other arm to pull back as tightly as he could, strangling them. He killed most victims in his home, his truck, or a secluded area. Most of their bodies were dumped in wooded areas around the Green River, Seattle–Tacoma International Airport, and other "dump sites" within South King County.

In the early 1980s, the King County Sheriff's Office formed the Green River Task Force to investigate the murders. Task force members included Robert Keppel and Dave Reichert, who periodically interviewed incarcerated serial killer Ted Bundy in 1984. Bundy offered his opinions on the psychology, motivations, and behavior of the killer. He suggested that the killer was revisiting the dump sites to have sex with his victims, which turned out to be true, and if police found a fresh grave, they should stake it out and wait for him to come back. Also contributing to the investigation was John E. Douglas, who developed a profile of the suspect.

With his second wife Marcia, Ridgway had a son, Matthew (b. 1975).

Ridgway graduated from Tyee High School in 1969 and married his 19-year-old high school girlfriend, Claudia Kraig. He joined the U.S. Navy and was sent to Vietnam, where he served on board a supply ship and saw combat. During his time in the military, Ridgway had frequent sexual intercourse with sex workers and contracted gonorrhea; although angered by this, he continued this activity without protection. While Ridgway was abroad, Kraig had an extramarital affair. Their marriage ended within a year.

Gary Leon Ridgway (born February 18, 1949), also known as the Green River Killer, is an American serial killer. He was initially convicted of 48 separate murders. As part of his plea bargain, another conviction was added, bringing the total number of convictions to 49, making him the second most prolific serial killer in United States history according to confirmed murders. He killed many teenage girls and women in the state of Washington during the 1980s and 1990s.

Gary Leon Ridgway was born on February 18, 1949, in Salt Lake City, Utah, the second of Mary and Thomas Ridgway's three sons. His home life was somewhat troubled; relatives have described his mother as domineering and have said that, while young, he witnessed more than one violent argument between his parents. His father was a bus driver who would often complain about the presence of sex workers.