her father, homero, even hires him to work at the family's furniture store. >> translator: i ended upuch. ♪ >> reporter: sindy lu knows nothing of her boyfriend's true identity. but one night she gets a terrifying glimpse. it's what he says while consoling her after she smashes her guitar during an argument with her mother. >> translator: he said, "no, relax. let's fix things." he said, "don't be angry at your parents. if you want we can kill them." so i told him "no, but it's not a big deal. and that's the only time i felt a bit of fear, but i know maybe he said that so i would calm down, or to get me to laugh. >> reporter: but no one was laughing. certainly not back in texas, where even kent whitaker was now beginning to believe the worst. >> when he ran away it kinda kicked the third leg out of the stool, that he must actually have been involved. by that point in time i'm thinking it's pretty hard for me to extend any potential arguments against it. >> reporter: but investigators still had no physical evidence, no clue who fired the murder weapon, and no idea what happened to bart