(As Beckett goes to speak to the sister of the deceased, to tell her what happened)
Castle: How does she do that?
Capt. Montgomery: (seeing an alternative meaning) Better than anyone I know.
Castle: (looks over at the captain) You okay?
Capt. Montgomery: Her brother died trying to get something to me. No. I'm not okay.
(The original victim's casket has just been opened by Dr. Perlmutter)
Castle: Someone had to have paid to get rid of the body, just in case Brady every wanted to come clean with the police.
Beckett: Mmm-hmm. Looks like it.
Castle: This guy's got contingency plans for his contingency plans! It's like we're battling a supervillain!
Dr. Perlmutter: Excuse me! Dynamic duo! (Closes the casket) What am I doing with this?
Castle: Well, it depends. What can you get for a second-hand casket these days?
Beckett: I'll call Olivia's family and find out what they want to do.
Castle: Seriously, though. I wonder what you could get for a slightly used coffin. That thing is top of the line! (spinning around, realizing...) Did you check the drawer?!?
Dr. Perlmutter: What drawer?
Castle: High end coffins often have a small drawer hidden somewhere in the lid. That way one can hide his momentos in there, or psychotic killers can hide evidence...
Beckett: Are you looking at porn?
Castle: I use Ryan's computer for that.
Title: Kill The Messenger
The title phrase is a common riff off a phrase associated with Shakespeare: "Don't shoot the messenger", which occurs in both the play Henry IV, Part 2 as well as Antony and Cleopatra. The concept predates that, however, to the time when an envoy with a message might be sent to an opposing leader, who, in rage at the content of the message, might strike at the messenger standing in proxy for the author.
Dr. Perlmutter: Excuse me! Dynamic Duo! What am I doing with this?
The Dynamic Duo is a term often used to refer to the pairing of Batman and Robin, popularized during the 60s with the campy live-action Batman TV series.