If the cops place her time of death between 8pm and 9pm, I wonder about the witnesses that claim (2 separate ones, I believe) that they heard a man and a girl talking after 9pm and someone who claims to have seen persons with a flashlight between 11pm and 1230am, presumably sitting on bleachers in the park, and a vehicle parked in the park lot. That means that a) the witnesses are incorrect b) the cops are incorrect about time of death c) persons unrelated to the murder were there after she was murdered or d) the perp or perps came BACK to the scene, perhaps to retrieve a weapon or what have you. Based on the witness accounts, I would have thought her death was after the 8pm to 9pm window.
Another thought of mine (pure speculation) is that someone went to the park that knew Jessica may be there to bring her home, especially if she had a history of hanging out there. She refused to go with them (back home or whatever) and things got ugly.
MonkeyMann - KCRA3 claimed that Sac Sherriffs do in fact have surveillance of her on RT to Watt from Butterfield, then took a bus to somewhere near Einstein and was seen on surveillance cameras with "students" at Einstein at 6:30pm.
