Thirty-five-year-old Rachel Cumberland and 28-year-old John Robert Williams, both of Leake County, have now been moved to the Lafayette County Detention Center in Oxford.
Both recently pleaded guilty to charges relating to last summer's kidnapping and killing of 28-year-old Nikki Hill of Shuqualak.
On July 18, 2004, Hill was found shot to death on a dirt road in the western part of Neshoba County.
Williams was sentenced to life in prison and Cumberland to 20 years behind bars.
According to investigators, the two are wanted for questioning in another death in Lafayette County and others in at least three other states.
"During the investigation some things were said that led to Yukon, Oklahoma," said Investigator Ralph Sciple with the Neshoba County Sheriff's Department.
Aside from being questioned for the 2003 murder of an Oklahoma City woman, the two are also wanted for questioning in murders in Texas and Arkansas.
In several of the cases officials say the victims were thought to be prostitutes who were kidnapped from truck stops.
"I don't believe she was a prostitute. I think she just got with the wrong people," said Sciple, referring to Hill. "But once she got in the car, it was too late."
With the two facing at least two murder charges, investigators say it's possible Williams and Cumberland will never get out of jail. If they are charged with capital murder, the penalty could be death by lethal injection.