Lester Holt

A fertility doctor thought the bodybuilding supplement known as creatine just might help Autumn get pregnant.

As it turned out, her husband Bob had been using the stuff in his research.

So on April 17th, Autumn Klein seemed ready to give creatine a try.

She texted her husband that day, I ovulate tomorrow.

He answered, perfect timing, creatine, smiley face.

These are hospital security camera pictures that show Autumn throughout the day and leaving work late that night.

Ten minutes later, she was home.

And minutes after that, her husband, Bob Verante, was on the phone to 911.

His wife slumped on the kitchen floor, gasping for breath.

The dispatcher asked the husband what he was seeing.

I think my wife is having a stroke.

Paramedic Steve Mason and his partner arrived at the Ferrante home to find a woman in very bad shape.

An hour after walking home from the medical center where she worked, Dr. Autumn Klein, seen here in hospital surveillance footage, was back as a gravely ill patient in its emergency room.

And whatever was happening to her was a medical mystery to the team trying to keep her alive.

Then they saw the blood, so neon red, so out of their experience.

When we come back, Autumn is surrounded by some of the best doctors in the country.

But no doctor can work miracles.

To them, this was out of this world.

Just couldn't make any sense out of it.

Maybe someone else could.