Unknown : Defense attorney says Arias had abusive behavior , mental disorder . NEW : Graphic testimony expected . Prosecutor describes the bloody scene in a bathroom . A 12 - 0 vote by jury is required to execute him by lethal injection . This means Arias ' lawyers need to convince only one juror to accept a life sentence .
Unknown : Defense attorney says Arias had abusive behavior , mental disorder . NEW : Prosecutor describes the bloody scene in a bathroom . A 12 - 0 vote by jury is required to execute him by lethal injection . This means Arias ' lawyers need to convince only one juror to accept a life sentence .