Dr. Anthony Lapalla, a psychologist at the Federal Correctional Institution in Texarkana, believed the killer was planning to continue to make unexpected attacks such as that of Virgil Starks on the outskirts of town. He also believed that the same person committed the murders of Virgil Starks, Betty Jo Booker, Paul Martin, Polly Ann Moore, and Richard Griffin. Further, he believed the killer's age was somewhere between his mid-30s and 50. He said that the killer was apparently motivated by a strong sex drive and that he was a sadist. He stated that a person who would commit such crimes is intelligent, clever, shrewd, and often not apprehended.