NEW : Officer went to Nevada to ` ` clear his name '' after death threats , lawyer says . Ex - police officer Johannes was charged with murder . Oscar Grant III was shot to death at Sacramento , California , police station . Grant 's death has spawned public outrage and a string of protests .
NEW : Officer went to Nevada to `` clear his mind '' after death threats , lawyer says . Ex-BART officer Johannes Mehserle charged with murder . Oscar Grant III was shot to death at Oakland , California , transit station . Grant 's death has spawned public outrage and a string of protests .