State District Judge Jason Cashon, left, gives an oath to psychiatrist Dr. Mitchell H. Dunn before he testifies at the trial of former Marine Cpl. Eddie Ray Routh on Feb. 19, 2015, in Stephenville, Texas. (LM Otero / AP)
Eddie Ray Routh’s sister Laura Blevins testifies during the capital murder trial of the former Marine Cpl. at the Erath County, Donald R. Jones Justice Center in Stephenville, Texas, Feb. 18, 2015. (Mike Stone / AP)
Eddie Ray Routh’s ex-girlfriend Jennifer Weed testifies during Routh’s capital murder trial at the Erath County, Donald R. Jones Justice Center in Stephenville, Texas. (Mike Stone / AP)