Had this happen on a flight from Honolulu to Atlanta a few years back. Stews did not know CPR and tried to give oxygen to someone not breathing. Probably had 10 people on the plane certified, but they never asked. Landed at 2AM in LA and they wouldn't move the body til a coroner showed up so we were stuck in an empty terminal for five hours. At least on a cruise they can handle it.
By the way, her husband continued on the flight to Atlanta.