I'm Andrea Canning, and this is a story I'll never forget because of when the murder happened.

It was a day for flowers and chocolate and romance.

A day you'd never expect such violence.

The forbidden relationship at the center of this case.

It was one of the most bizarre I've seen on Dateline because of who they were and where

they'd go to sneak around.

It all made my jaw drop.

But what really made this story so memorable was an unexpected three-hour interview that

was hard to believe.

Here's Deadly Valentine.

It happened on the least likely day imaginable.

A day devoted to love and affection.

Valentine's Day and it happened to the last people on earth you would expect, a religious

family dedicated to God and making the world a better place.

Is it going on right now?

Their perfect world broken by an act so evil it tore a family apart.

The worst day of my life.

And put an entire town on edge.

The extra cautious, lucky doors, lucky windows pay attention to strangers in your area.

They devoted their lives to others.

Who would ever want to hurt them?

It's just absolutely a despicable act.

...