reporter: prosecutors believed the original plan was to kidnap ashlea, kill her, and put her body in that grave. she was killed in her apartment, the prosecutors thought, because she fought so hard. what is that? this is a glock 19 semiautomatic pistol. reporter: in fact, investigators believe ashlea harris was pistol whipped. so when this glock 19 was found in the black infiniti, prosecutor deener had it tested. the results were both sad and conclusive. it came back positive with ashlea s dna on the gun, so that was very significant. there was blood adjacent to her bed. and blood splattered on the bed. this was not an easy death. reporter: hearing all this was so hard on ashlea s mother monica and loved ones like april. i thought i could handle it. huh-uh, nope. so i went out and i went back into the room where monica was. and she was consoling me. and she shouldn t be consoling me. reporter: the brutality of
reporter: why was that significant? because of a discovery way out in the texas scrub. a discovery worthy of a horror movie. and the key to finding it was right there on carter and david s cell phones. they would text each other longitude and latitude coordinates, and it led us to a remote area near abilene. reporter: what was there? as soon as we got to where the spot says, you re there, we look up and there s an actual human grave that s been dug. reporter: fresh grave? fresh grave. reporter: prosecutors believe the original plan was to kidnap ashlea, kill her, and put her body in that grave. she was killed in her apartment, the prosecutors thought, because she fought so hard. what is that? this is a glock 19 semiautomatic pistol. reporter: in fact, investigators believe ashlea harris was pistol whipped. so when this glock 19 was found in the black infiniti,
lover. he was tellin me what to drink, what to eat, um, and he made me have sex with him in the movie theater. reporter: and he had that gun, the glock, she said. used it like a threat and it scared her. did not feel comfortable with that weapon. reporter: she told the jury she was asleep at home when ashlea was being murdered. she didn t know where david had gone but somehow he wound up with a set of american eagle keys. gave me some gloves, told me to put them on, and then handed me a pair a set of american eagle keys. and he said go in and open the gate and bring me that fat ass deposit. reporter: and then she said he pulled out the glock. and he just pointed it at me. pointed it at you? yes, across his body. i shook my head that i wasn t going to do it. um, and he said, you don t understand. there s someone sitting outside your parents house right now. if you don t go in, i m gonna kill them and then i m gonna kill you. reporter: so that s why she tried to
made me have sex with him in the movie theater. reporter: and he had that gun, the glock, she said. used it like a threat and it scared her. did not feel comfortable with that weapon. reporter: she told the jury she was asleep at home when ashlea was being murdered. she didn t know where david had gone but somehow he wound up with a set of american eagle keys. gave me some gloves, told me to put them on, and then handed me a pair a set of american eagle keys. and he said go in and open the gate and bring me that fat ass deposit. reporter: and then she said he pulled out the glock. and he just pointed it at me. pointed it at you? yes, across his body. i shook my head that i wasn t going to do it. um, and he said, you don t understand.
the original plan was to kidnap ashlea, kill her, and put her body in that grave. she was killed in her apartment, the prosecutors thought, because she fought so hard. what is that? this is a glock 19 semiautomatic pistol. reporter: in fact, investigators believe ashlea harris was pistol whipped. so when this glock 19 was found in the black infiniti, prosecutor deener had it tested. the results were both sad and conclusive. it came back positive with ashlea s dna on the gun, so that was very significant. there was blood adjacent to her bed. and blood splattered on the bed. this was not an easy death. reporter: hearing all this was so hard on ashlea s mother monica and loved ones like april. i thought i could handle it. huh-uh, nope. so i went out and i went back into the room where monica was. and she was consoling me. and she shouldn t be consoling me. reporter: the brutality of