After a brutal killing spree during the 1980s and 90s, Gary Ridgway pleaded guilty to 49 murders in 2003. We look into who actually survived encounters with the serial killer.

Since his incarceration in 2004, for the murders of 71 teenage girls and women, 'Green River Killer' Gary Ridgway has lived a life of isolation at Washington State Penitentiary.

Learn about the early years of one of America's most infamous serial killers, Gary Ridgway, who was convicted of murdering 49 people.

Serial killers have long targeted prostitutes—from Jack the Ripper, an uncaught murderer who terrorized women in late 19th-century London, to the Long Island Serial Killer, an uncaught murderer whose last confirmed victim disappeared in September 2010 after advertising sex work on Craigslist. We explore the various reasons why serial killers prey upon sex workers.

Gary Leon Ridgway, who raped and murdered more than 49 women, was obsessed with deviant sex and visiting prostitutes. This, combined with his aggression and violence, were significant driving forces behind his murderous actions, says Mary Ellen O'Toole, a retired FBI senior profiler who interviewed Ridgway.

Dr. Mike Aamodt, forensic psychology professor at Radford University, on why female serial killers have declined over the years, why there was a big jump in serial killings in the U.S. between the 1960s and 1980s and his most surprising finding in his research of serial killers.

From Green River Killer, Gary Leon Ridgway to Ted Bundy to Harold Shipman and more, experts on serial killers tell A&E True Crime who was the 'worst' serial killer and why.