Tonight on Dateline. It really hits deeply. Actually seeing the crime scene photo, it made me just very, very angry what had been done to Angie.

The day that Angie was found, had my whole system shut down.

Everything just shut down.

Who would do that to Angie?

To one of our friends.

The accusations were flying. They were running and gun it for anybody.

You're handcuffed? Yeah, they treated me like I was part of this nasty crime.

They were convinced that you were there. Yeah. These people robbed my life for 20 years for something I never did.

All they kept saying is he confessed, Carol. He confessed.

I said, what is going on here. I went to the streets searching for her killer.

She was advocating for justice. She was a force to be reckoned with. She was not

going to let it go. She begged me to give it a deeper look.

But potentially have a break on this?

Oh my gosh.

We're going to go solve a murder.

We're going to solve a 25-year-old murder.

Years lost, lives shattered.

A mother fights to uncover the truth.

I'm Lester Holt, and this is Dateline. Here's Keith Morrison with true.

Here's Keith Morrison with true confession.

They call it the snake river and it glides wide and placid past the gleaming white Mormon

temple and then twists and tumbles over rocks and weirs through the town of Idaho Falls.

...