Authorities say the 22-year-old driver of a BMW that struck and killed four Pepperdine University students in Malibu has pleaded not guilty to four counts of murder. Prosecutors say Fraser Bohm was speeding at more than 100 mph moments before the crash. His attorney says the crash occurred as Bohm was being chased following a road rage incident. Authorities have said the driver lost control and sideswiped parked vehicles before crashing into the students walking on the scenic Pacific Coast Highway. Two others were also injured. Prosecutors say that if Bohm is convicted as charged, he could face multiple life sentences.