KNTV Dateline NBC November 8, 2010
>> a golden couple dead and down the beach, another attack. >> i just couldn't believe that someone so sweet and nice could have such evil around her. >> two murder cases in two weeks, and no one knew why. >> wow, what are we doing with here? are we dealing with a night stalker scenario? >> enter "dateline's" own team of investigators. >> this was a crime of passion. >> our law enforcement veterans sift through the clues, from a man in disguise -- >> he's a nervous type of person. i mean, he dropped the gun. >> -- to an online rendezvous. >> there's a darker side that we don't know. ...