If your loved one was currently receiving medical care, be sure to notify the doctor. If your loved one was in hospice care, it is not necessary to call 911. You can call the hospice facility direct.
You will need to notify family, friends and clergy. It may be easier on you to make just a few phone calls to close relatives and ask them to inform specific people so the burden of spreading news does not rest entirely on you. If you are alone, don't be afraid to ask someone to keep you company as you make the first phone calls and cope with the first hours after the death.