OKLAHOMA CITY - As a suspected Oklahoma serial killer sits behind bars, the family of one of his teenage victims is speaking out about the long road to justice. It's been several years since police arrested John Robert Williams after more than a dozen killings at truck stops along I-40.

Police believe Casey Jo Pipestem was murdered nine years ago after being abducted in Oklahoma City. Now, her family members say it's been long enough. They want a conviction, but most of all they want closure.

"She was beaten, raped, strangled and thrown off a 37-foot bridge naked," Pipestem's older sister Taffney Harjo said.

Harjo says no more than 24 hours after her sister was kidnapped from a southwest Oklahoma City truck stop, her body was found 200 miles south in Grapevine, Texas.

"It happened to us, and not only us, but 13 other families," Harjo said.

For years, police had been baffled by the big rig killer and his girlfriend accomplice, who were suspected of leaving a trail along the I-40 corridor as far east as Tennessee. It was shortly after a story aired on America's Most Wanted when police finally caught up to murder suspect, John Robert Williams.

"Even though it was nine years ago, it's an everyday process that I have to fight every morning so I can go on with my day," Harjo said.

Authorities believe Williams could be responsible for as many as 14 murders in at least six different states, creating a prosecution nightmare. Harjo says justice for Casey Jo Pipestem has been put off and delayed by Texas prosecutors time and again.

"Her case just started getting pushed to the side," Harjo said.

Harjo suspects large caseloads but has never been given a sensible reason for the delay. She hopes speaking out now will remind people that Williams is still waiting to be judged and many families are still looking for closure.

A Call For Justice candle light vigil, organized by Pipestem's family, will be held January 31, 2013 at 5 p.m. at Woodson Park. The park is located at S.W. 29th Street and May Avenue in Oklahoma City.

For more information, contact Taffney Harjo at (405)-517-4943.