It brought back sleepless nights for me after you called me. I dreamt about it, the sounds of their voices, the looks on their faces, that's a trauma that I can't wrap my head around.

But I sure heard it.

San Angelo, Texas, July 4th, 1988.

Shane Stewart's Camaro was parked just outside of town at O.C.

Fisher Lake.

Shane and his girlfriend Sally McNined on the hood, looking into the night sky.

They dreamed aloud about their future together.

A fresh start. That night night they never came home. Their bodies were found four

months later. What happened to Shane and Sally is still a mystery, but there were witnesses and warning signs.

She said, if you don't hear from us in a couple of months, then we're dead.

And I recall telling them, you guys better be careful you're going to piss off the wrong people.

We talked about could have been satanic possible.

Could have been a drug deal that went south possible. Could have been they were out there and

they saw something they weren't supposed to see.

Shane and Sally loved hanging out with their friends, speeding around San Angelo at night.

But at some point their mischief with friends crossed over into something much darker, much more dangerous.

Shane and Sally worried they were in over their heads.

This is the Devil's playground down here, and you have to be very careful.

Me and my brother told him just leave that one alone.

Just live your life, leave it the fuck along.

You don't want to find him. It's just, there's something ominous about this whole case.

For 35 years, Shane's father Marshall has been searching for answers and struggling to understand

...