Inmate may be connected to 7 women's deaths Texas investigator questions convict about truck-stop abductions. A Texas investigator visited Mississippi last month to once again interview a state inmate possibly linked to the serial killings of seven women believed abducted from truck stops in several states during 2003 and 2004. About two years ago, investigators from a multi-state task force came to Mississippi to question John Robert Williams and his girlfriend, Rachel Cumberland, of Carthage in relation to the slayings of seven female victims. In a case unrelated to those killings, Williams, 30, is serving a life sentence at the Mississippi State Penitentiary at Parchman. He pleaded guilty in 2004 to the kidnapping and shooting death of Neshoba County resident Nikki Hill, whom he and Cumberland met at a casino. Cumberland, 37, pleaded guilty to manslaughter in the case and is serving a 20-year sentence. It was reported two years ago that Williams and Cumberland could face charges in Lafayette County in the death of an Oklahoma City woman whose body was found Aug. 20, 2003, off the Tallahatchie River Bridge. But those charges have not been filed. The Texas case involves the death of Casey Jo Pipestem, 19, a member of the Seminole tribe, whose body was found in January 2004 off a bridge in Grapevine. She last had been seen alive at an Oklahoma City truck stop. On June 4, 2005, Pipestem's case and those of the other women were included on the television show America's Most Wanted. Williams had been a long-haul truck driver, and Cumberland often accompanied him on trips, according to authorities.