Breaking Bad, Season 5

[Lydia calls Todd, who is lying dead. Walt picks up the phone.]

Walter:
Hello?

Lydia:
Is it done? Is he gone?

Walter:
Yeah, it's done. He's gone. They're all gone.

Lydia:
Todd? Who is this?

Walter:
It's Walt. How are you feeling? Kind of under the weather? Like you've got the flu? That would be the ricin I gave you. I slipped it into that stevia crap that you're always putting in your tea.

Lydia:
Oh, my God.

Walter:
Well... goodbye, Lydia.