A local photographer captured video of thick black smoke pouring from the boat.
The body of the missing boater had been recovered first, so it wasn't until deputies found the beached vessel later in the day, that they were able to identify the victim.
Footage of the rescue released by the Coast Guard shows Charles Gregory seated in the inundated boat, its bow dipping beneath the surface of the water, before rescue crews reached him.
"It's really fortunate, because within three seconds of them jumping off of the boat, it exploded," said Nathan Greenwood.
A pod of Orcas, also known as "killer whales," attacked a boat off of Spain in a growing trend experts say might be "revenge" for years of being injured by them.
The five people aboard the boat were last seen Sunday afternoon.