An Alabama physician is set to go on trial this Friday on charges that he improperly prescribed fentanyl and other drugs to 3 Doors Down guitarist Matt Roberts, who died of a drug overdose in August 2016. Dr. Richard Snellgrove faces a 13-count federal indictment in Mobile alleging unlawful distribution of controlled substances and health care fraud. Snellgrove allegedly prescribed the drugs that killed Roberts, who was found dead in in a hotel hallway near Milwaukee, where he was scheduled to perform at a charity concert. A medical examiner later ruled the cause of death to be an overdose involving fentanyl, hydrocodone and alprazolam.