Greene County authorities think the killer of a 13-year old girl in 1997 has been found in prison, in Texas. A deputy sheriff has interviewed Tommy Sells about the murder of Stephanie Mahaney of Springfield, and says Sells has given information that only the killer and investigators know. County prosecutor Darrell Moore says Sells apparently was waiting for another victim when he came upon the Mahaney girl. Sells is under a death sentence in Texas for killing another 13-year old girl. He has given statements linking himself to more than 50 killings, including two in Branson 15 years ago.