CALL 911 and ask for the ambulance. They will arrange the appropriate service to come, depending on who is available in the area. This may be ambulance attendants or other first responders trained to assess vital signs. They are mandated to start CPR, unless a Do Not Resuscitate request, or a Living Will signed by the person who has died, is available. The Coroner is notified in all cases of unexpected death.
There is no legal requirement regarding the timing for the removal of the body from home. There is, however, legal restrictions about who can authorize the transportation of the body. Verbal or written authorization is needed from the executor or the next-of-kin.