for his mother s murder is obvious. she was worth more dead than alive to his step-dad. let me hear your indictment for bill kyne for murder. kills your mother why? money. $750,000 could help him out a lot. reporter: detectives thought they had a plausible motive. now they combed through bill s 911 call and his lengthy interview on the day of the murder. not everything seemed to add up. reporter curtis krueger noticed something curious reported by the first deputy at the scene. the first responders arrived, and attempted to take a pulse of diane, and they found her body to be somewhat cold. and that, of course, indicates that she may have been dead for a while. reporter: that deputy arrived just minutes after bill said he d caught kevin in the act. diane s body temperature may have suggested a different timeline. detective beining was troubled by another part of bill s story. he said he never went back to check on diane after kevin ran off. i assumed that she was already de