Ensign Andrew El Munz was a soldier in the U.S. Navy in Vietnam.

Now he's buried in Arlington National Cemetery.

He died in 1968 while serving aboard the U.S.S. Kacapon in the Philippines.

But his death didn't come by way of enemy fire.

His death was a mystery.

Some suspected foul play. Some called it an accident.

The Navy's officials stance was that Ensign Muns went AWOL,

that he was a deserter and a disgrace.

For Andrew's sister, Mary Lou Taylor, that was an answer she couldn't live with.

She knew, deep down on her gut, who her brother really was. And that kind of person he was.

She knew he would never desert his post.

And that meant he must have been murdered.

From A&E, this is Cold Case Files the podcast.

I'm Brooke, and this story, adapted from a classic episode of Cold Case Files

is told by the resplendent Bill Curtis.

Well, we're going to go up the hill to my brother's grave site. It's always hard to find it because there's so many.

Mary Lou Taylor walks past row after row of headstones.

Each marks the resting place of an American hero.

In at least one case, the headstone memorializes a murder victim.

This is it.

In memory of Andrew L. Muns, ensign, US Navy, Vietnam,

October 12,

...