the prosecutor laid out his case against keith griffith.stand in his own defense and had a bombshell to reveal. here's dennis murphy with the conclusion of consumed. >> keith griffith was about to take the stand and explain the most damning piece of evidence against him. hotel security footage that put him off the grid for more than 6 1/2 hours the night his wife julie was murdered. but if he wasn't perpetrating the crime during that time, then where was he? >> tell us your name please, sir. >> keith's explanation came with an embarrassing secret. his lawyer argued that ever since becoming a traveling salesman, keith had struggled with an addiction to sex. >> did you have this kind of sexual conviction? >> no, sir. >> he said he spent those hours out prowling for women. he changed out of work clothes into his man out looking duds. >> i was able to -- carousing. >> he says he went to a bar, but try as he might, he never found a hookup. >> i was trying to pick somebody up, and there wasn't anybody interested, or whoever you want to put it. >>