Basically, the kind of stunts you pull for fun without a second thought in GTA is guaranteed to be first degree murder in the real world. The California penal code defines first degree murder as 'willful, deliberate, and premeditated killing,' or any killing that occurs during during the commission of another crime, such as arson, rape, carjacking, robbery, burglary, mayhem, kidnapping, or train wrecking.
Max sentence: Life without the possibility of parole