jason. it came from a .38 caliber hand gun. >> we did find a gun in the home where mr. harperut it wasn't the gun that killed jason. so no murder weapon and the only suspect wasn't talking. >> we believed that there was an argument between the two and a gun was produced and she shot him. and we were -- we didn't know why. >> not an easy question. >> narrator: cs an answer, but you think anyone intended to >> coming up -- >> i don't understand why any of it happened. you know what i sneen. >> new clues. >> she was preparing for a change in her life. >> private journals and secrets in the attic. >> my wildest dreams i would . >>> by the time julie harper's attorney arafrped for her to turn herself in, her husband jason had been dead for a day and a half. for reasons nobody could understand. they appeared to be a solid couple. why would she shoot him? that's what carlsbad detectives were deshld to figure out. julie wasn't talking. so they interviewed friends and family and peeled back the layers and sergeant jeff smith learned that a whole year earlier julie sent a friend envelop