From the Center for Investigative Reporting and PRX, this is Reveal. I'm Al Letson.

In July of 2018, producer Kate McMahon was vacationing with her family in Victoria,

British Columbia. One morning, Kate made a discovery that would send her into a year-long

reporting journey. So Kate, tell us what happened that morning.

Well, I was going for a run and I spotted a herd of deer in some woods across the road.

So I decided to follow them to take video with my smartphone for my kids.

See, it's a mama, a daddy, and a baby fun.

I realize I'm standing in this cemetery. One gravestone I'm standing over totally gives

me chills.

Tanya van Kylenberg, 1969 to 1987. She parts her wings and then she's gone.

She was only 18 years old. I'm wondering, car accident, drug overdose, and so I take a

picture of her grave.

It was just a moment of feeling like I wanted to put good thoughts out there for this girl's

family, whoever they were.

And then something mind-blowing happens later that night. I show my husband the photo

and he says, I know that name. I don't believe him. We are in a foreign country and I had

followed deer into a random cemetery. So I go online and find out he's actually right.

Tanya's name had been in the news that week and I find out how she died. She and her

boyfriend had been murdered 31 years before and no one had been arrested until now.

So what happened to them?

Well, I'm going to take us back to the beginning.

Since November 18, 1987 and this young Canadian couple Tanya van Kylenberg and Jay Cook are

...