Two snorkelers die in separte accident in the Keys over the past 48 hours.
One woman from Pennsylvania who had evidently had medical issues and a pacemaker died while snorkeling off the coast near Marathon - the other, a man from Texas, died while snorkeling in the Dry Tortugas.
Cause of death in both instances was not immediately known. Autopsies will be performed.
(Photo: AFP / 2010 AFP)