Jorge Liderman, 50, music theory and composition professor at UC Berkeley, died on Sunday after being hit by a BART car at El Cerrito Plaza. At around 9:30 a.m., it seems, the BART train operator claims that as the car was about four or five feet from the station, Liderman hurled himself in front of it, killing him instantly. And although the word "suicide" is being tossed about, his cause of death is still......