A, a 76-year-old woman, was brought to the hospital in a coma with slight cerebral hemorrhage. An endotracheal tube was inserted in her mouth to facilitate her breathing. B, a hospital janitor, removed the tube. The victim started to convulse and bleed in the mouth. Only the timely arrival of the nurse prevented the patient's death. The patient was then transferred to another hospital where she died the next day of cardio-respiratory arrest. Is B criminally liable? If so, what crime was committed? (1991 BAR)