>> prosecutor raymond mcginty laid out a formidable circumstantial case. >> on january 17th, 2014, keithd that he could kill his wife -- >> a cornerstone of the case was that hotel security video. not only did it show keith gone for enough time to commit the crime, the prosecutor said, it also caught him in a lie. remember in his interview, keith told police he hadn't swapped clothes that night? >> -- change clothes? >> no. >> but a look at the security footage showed he had. >> he left wearing one set of clothes. one of his work shirts. he came back dressed in all black. >> the prosecutor also showed security video captured from a residence near the griffith home. it caught a glimpse of an suv pulling into the subdivision shortly before the fire. >> it was a little blurry. it was a few seconds long, but it sure looked like keith griffith's car. >> and another circumstantial bit. who else but keith, the prosecutor said, could have gotten by the griffiths' aggressive great dane cleo? certainly not an unknown intruder. >> the dog and keith were very close. a burglar couldn't have come in.