The Beaver County District Attorney’s office says a letter an inmate received claims an Aliquippa police officer shot and killed Rachael DelTondo in her mother’s driveway in May. Investigators say they are working to determine the authenticity of the letter sent to 21-year-old Wayne Cordes of Aliquippa, who had been facing assault and robbery charges. Cordes received a plea deal in exchange for his testimony about the letter sent to him while he was in jail. Police say DelTondo was shot ten times at close range May 13th.