A man has been arrested in connection with the Mississippi highway shootings that killed two motorists in Tunica County earlier this month, police said Friday. James D. Willie, 28, of Sardis, was arrested Tuesday when police found him with a woman who claimed he raped her, and he had a semiautomatic handgun at the time of his arrest. State crime-lab scientists determined the weapon matched the same one used in the two murders by an alleged police impersonator. Thomas K. Schlender was found dead in his car on Interstate 55 on May 8, and three days later Lori Anne Carswell was found dead outside her car on the shoulder of a state highway.