Convicted serial killer Gary Ridgway claimed he actually committed almost twice the number of murders he was convicted for, KOMO-FM reported on Tuesday.

"The total number [of victims] is 75 to 80," Ridgway said in a phone interview with KOMO. Ridgway, known as the "Green River Killer," was initially convicted on 48 counts of aggravated first-degree murder, agreeing to serve one life sentence for each killing in exchange for avoiding the death penalty. He was sentenced in December 2003. His sentence was increased by one life sentence after the body of a 49th victim was found in 2011.

Ridgway told KOMO that he was not able to tell investigators where he buried many of his victims' bodies, despite being taken to various sites by a police task force, claiming he was only allowed to identify victims at three or four out of 20 possible locations.

"They should have had me get out at every site to show them where I put those bodies," Ridgway said to KOMO. "If I could do it all over again, I would say I want to get out at every single site."

Reporter Charlie Harger, who conducted the interview, told ABC News that though Ridgway now claims to practice Christianity, he has an ulterior motive for saying he wants to help investigators find more of his victims.

"I think he wants to show the world that, 'Here I am, Gary Ridgway, the truck painter from Kenworth, the guy who everybody thought was slow since elementary school, somebody who couldn't hold a candle to Ted Bundy,'" Harger said to ABC News. "But, here I am, and I'm the best at something."

Watch a report on Harger's interview with Ridgway, aired on KOMO-TV on Monday, below.