She was brave. She was incredibly brave.

Why didn't I know that she needed me and that she was alone and that she was hurt?

Nothing was the same after that. Nothing.

They found her in the soccer field, the straight, arrow student,

killed by a single bullet.

I just hit the floor. I remember the pain.

Every time I talk about it, the pain comes rushing back

that someone would shoot my child. Like, why?

This was a small town who'd done it. Oh yeah, we were afraid.

What had happened that night was the answer somewhere in her circle of friends.

We're trying to find out why I would never hurt Hayley.

They came and talked to me with 4 FBI agents.

He's there. He's got a gun. How could it have not been him?

Then a secret spills out in court.

That's a bombshell. I definitely was.

I feel like I had gotten my heart ripped out.

For that mother to get on that stand,

it was absolute silence.

A hard-stopping revelation by the less person you'd expect.

I'm Lester Holden. This is Dateline.

Here's Andrea Canning with on the outskirts of town.

I'm miles from my family in New York,

...