. >> it turns out fulton county prosecutor clint rucker was thinking the same thing. >> there was noe gun at the time it was discharged. it was in perfect operating condition. it had 12 pounds of pressure needed to pull the trigger. >> meaning it is not easy to do. >> it is not easy to do. it became very clear to me this had to be an intentional act. >> diane's colleagues gave the da her computer and files, hoping rucker might find more evidence. >> and that is when the evolution of the motive then developed. >> rucker's investigators found documents suggesting tex was in financial trouble. what is more, diane's colleagues revealed she had been working on a new will. rucker wanted to find that will so he got a search warrant for the ranch and condo. no will turned up but something else did, a glock in tex's condo. that was a violation of his bond, so tex went back to jail. the next day rucker filed new charges and the tex mciver cases catted fr escalated from careless accident to malice murder. it was according to tex's sister, dixie, proo pos truss. >> if you're going to kill your w