Richard Castle: You know, I got- gotta say, when I volunteered to take Cosmo, I-I thought I was doing it for his benefit. But... I realized I was doing it more for mine. I... When Alexis was little, Meredith really wasn't around. So, I-I did it all on my own. And... when yo-you said you weren't a baby person...
Kate Beckett: Okay, okay, I get it. You were thinking that...
Richard Castle: Yeah.
Kate Beckett: Okay, well, I'll tell you what. When the time comes... there's no way I'm gonna let you take care of our baby on your own.
Richard Castle: So you, being the expert veteran of dozens of crime scenes, decided to pick up the murder weapon, to what? Ensure that we had your prints?
Richard Castle: Maybe you missed the part where I said she was shot dead. When I heard the noises coming from the next room, I thought whoever killed her was coming back. So I picked up the gun to defend myself. It seemed like a very good idea at the time. That's when you, Esposito, and Annie Oakley come bursting through the door.
Captain Roy Montgomery: Annie Oakley?
Kevin Ryan: I kind of almost shot... Castle.
Kevin Ryan: What? He had a gun.