Tonight on Dateline. Your family had your ex-husband killed to try to help you didn't they?

No, that's completely untrue.

A new twist in this headline- grabbing case as a mother and son are accused.

You've got this rich playboy period on us.

My name is Dr. Charlie Adelson.

And he's been charged with first-degree murder

for killing his ex-brother-in-law, Dan Markel.

My brother, he knew Danny treated me badly.

Do you think you can talk your way out of this?

No, I don't.

I'm not part of the murder.

My parents have more reason to dislike Danny than almost anyone else.

Donna meddled in her children's business way more than most parents do.

You see Donna as a prime mover in this. Yes.

There's a lot of things that we have to do and we've got a very tight time frame.

They're boarding the plane.

We're looking for places that is no expedition.

They believe they're about to make their great escape.

I think the Adelsons became obsessed with Dan Markel and obsession can make people do terrible things.

Did you think finally the case has come to the doorstep of the family?

It was an important new chapter, definitely.

A murder plot unwinds.

...