OXFORD, Miss. (AP) -- Authorities in Mississippi say they've arrested two suspects in a string of killings of truck stop prostitutes, including several in Oklahoma. Authorities say John Williams[pictured] and Rachel Cumberland[pictured] of Carthage, Mississippi, have pleaded guilty in the kidnapping and death of a Mississippi woman and are suspects in the truck stop killings. The two are being held without bond. Williams and Cumberland are due in court next week on kidnapping and murder charges in the death of Jennifer Hyman of Oklahoma City. Hyman's body was found August 20th, 2003, in Lafayette County, Tennessee. She had been strangled....