13News uncovered a letter, allegedly signed by Allen and addressed to the warden of the prison he was held at, in the exhibits for the case. In Delphi, jurors were shown the evidence collected from the scene where Abby and Libby's bodies were found in 2017. Indiana State Police investigator Brian Olehy continued his testimony Tuesday morning. Indiana State Police digital forensic examiner Brian Bunner testified on the cellphone extraction of Libby's cellphone, which was found at the crime scene. MORE: https://www.wthr.com/article/news/crime/delphi-girls-murdered/delphi-murders-richard-allen-trial-abby-williams-libby-german-carroll-county-homicide-indiana-girls-murdered-frances-gull-court-courtroom/531-f6a14fbe-4531-4a6c-a6ca-99291d3ca549