When a patient dies in any facility classified as a nursing home by the department and operating under a permit issued by the department, a physician's assistant or a registered professional nurse licensed in this state and employed by such nursing home at the time of apparent death of such person, in the absence of a physician, may make the determination and pronouncement of the death of said patient; provided, however, that, when said patient is a registered organ donor, only a physician may make the determination or pronouncement of death; provided, further, that when it appears that a patient died from other than natural causes, only a physician may make the determination or pronouncement of death. Such determination or pronouncement shall be made in writing on a form approved by the department.