>> exactly. >> reporter: so after a ten-month investigation, the orem p.d. and the d.a.'s office arrested truman and charged him with murder. >> my mom called me and i fell to the ground crying and so happy that he was finally behind bars. >> reporter: going into trial, what did you think? >> i thought we had a strong circumstantial case. >> reporter: at trial the prosecution argued domestic violence ending in homicide. the defense, self-inflicted gunshot wound. the jury sided with the state. conrad truman was convicted of heidy's murder. >> it was like, finally got him. finally got him. >> reporter: and as far as you knew, that was it? >> that was it. >> reporter: did you think that was it? >> i did. >> reporter: but if you think that was it, well then you haven't been watching enough "dateline." coming up --