attorney larry mcnabb me had been living fast and loose, but things are finally slowing down for him. he had a thriving law practice, a wife he adored, and plenty of money. then, a new friend entered the picture, and a love triangle took shape. the murder was a whodunit involving three tangled lives. one of them was hiding a secret identity. to entangle this mystery, police needed to know, who was the mastermind pulling the strings? here's keith morrison with poison. >> it was september 11th, 2001. just about everybody knows where they were that awful day. like the glamorous trio that was traveling north through california's yosemite national park. even as the rest of the world's attention was focused on new york city, they were intent on their own urgent needs. their desires, their fears, their deadly love triangle. so they probably didn't appreciate the passing wonders, the astonishing cliffs, the waterfalls, the giants of way is -- any more than the one in the back seat, through fading eyes. here is one of them. his name was larry mcnabb, and he was a tall, handsome man from a well