Kate Snow

Richen's trial began Monday in the Summit County Courthouse in Park City, Utah.

Dateline producer Karen Israel was there and is joining us to give us all the details.

Hey, Karen.

Hi, Andrea.

And I know that you're a little under the weather and it didn't help that you had to wait hours to get into the courtroom, right?

No, and I apologize for my voice.

So yeah, there's been a lot of anticipation for this trial.

And especially on day one, there were spectators lined up well before 6 a.m.

to get seats in the courtroom.

The trial began with opening statements.

The prosecution went first.

And Karen, you and I, we've been on this story for a while.

We've learned pieces of their case over the past few years.

What exactly did they share on Monday in their openings?

So the state is accusing Corey of intentionally poisoning Eric with fentanyl.

And the attorney for the state, Brad Bloodworth, began by giving the jury a dramatic play-by-play of what the prosecution alleges happened that night, starting with Corey texting the man that she was having an affair with, love you, and then handing Eric a drink in their bedroom.

She nudges him.

He does not respond.

She sees that he is stiff and pale.

The prosecution told the jury this wasn't the first time Corey had attempted to murder Eric, that she'd allegedly laced a sandwich with poison a couple of weeks earlier on Valentine's Day.