 Those who were on the boat that day will tell you that the defendant picked his girlfriend, Robin Donoff, up, threw her into the water, jumped in after her. He held her underwater. They're going to try and establish that he had a conscious intent to kill. Two years after the incident, Tyler Mook goes on trial. They're going to try and establish that he had a premeditated design to effectuate the death of Robin Donoff.