A Red Onion State Prison Inmate In Pound Virginia Has Been Convicted By A U.S. District Court Jury In Abingdon Of Sending Threatening Letter To A Former Prosecutor Who Handled An Earlier Case Against Him. 55 Year Old Randall Keystone Was Found Guilty Of Two Counts Of Transmitting In Interstate Commerce A Communication Containing A Threat To Injure Another Person. Keystone Will Be Sentenced In Federal Court At A Later Date.