An American woman, presumed to have been killed by a shark while diving in Indonesia, possibly died from a medical condition before any encounter with the predator, according to her friend.

The American tourist who was devoured by a shark in Indonesia is believed to have died from a “medical issue” while diving, her friends told The Post Monday — revealing that she was an experienced deep-sea diver who was “really enjoying life.

Colleen Monfore was enjoying a diving trip with six friends around the Pulau Reong island off the coast of Indonesia when tragedy struck and she was dragged out to sea

In a blood-curdling incident straight out of a horror movie, Colleen Monfore's exotic island getaway turned into a nightmare when the 68-year-old American tourist vanished, feared to be eaten by a shark.

Colleen Monfore, 68, was with six friends exploring the ocean around Pulau Reong island on September 26 when she was dragged away by strong currents

Colleen Monfore, 68, from South Dakota, went missing on Sept. 26 off the coast of Indonesia’s Pulau Reong island.

A U.S. tourist was shockingly eaten to death by a massive shark while on vacation. A 68-year-old American woman was found dead inside the body of a shark caught by a fisherman in Indonesia. The woman was reportedly on vacation with her family when she disappeared in the ocean.

Photo via mapush/Shutterstock A fisherman in Indonesia found more than they were expecting on their last excursion. The fisherman noticed the shark was not in normal health, so they captured it and decided to cut it open to determine the issue.