to strengthen his case against dylan spellman, investigators in neighboring sinton, texas, received a mysterious letter addressed to kristene chapa s dad. immediately i knew this was something very, very big and very important. reporter: the letter writer described himself as a hitman hired by the person who d shot mollie and kristene. he wrote the gunman had sought his services to finish the job and make the only witness to mollie s murder disappear. what he s saying is, i was hired to kill kristene, but i m not gonna do it. instead, i m warning you. that s right. he s telling kristene chapa s father, i m gonna tell you who the murderer is, and then you can go do something about it. reporter: the letter contained details police had never mentioned in public. that he forced the girls to duct tape themselves. the fact that he called them by numbers, girl number one,
reporter: while detective aaron veuleman continued trying to strengthen his case against dylan spellman, investigators in neighboring sinton, texas, received a mysterious letter addressed to kristene chapa s dad. immediately i knew this was something very, very big and very important. reporter: the letter writer described himself as a hitman hired by the person who d shot mollie and kristene. he wrote the gunman had sought his services to finish the job and make the only witness to mollie s murder disappear. what he s saying is, i was hired to kill kristene, but i m not gonna do it. instead, i m warning you. that s right. he s telling kristene chapa s father, i m gonna tell you who the murderer is, and then you can go do something about it. reporter: the letter
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