Natalie: Hey, I guess this means you owe Chance Singer an apology.
Adrian Monk: Yeah, I guess I do. Maybe I'll bring him something. Like a bottle of wine or some overalls.

Adrian Monk: What's this?
Natalie: What? Oh, a note.
Adrian Monk: No, I mean this stationery. This is- This is from Vickie's roommate. I remember her giving me this piece of scrap paper. St. Andrews Medical Center. Radiology, Natalie. Radiology. My God. I think I know what happened.
Natalie: To what?
Adrian Monk: To the girl. To Vickie. Now that I can think strait. I know who killed her.

Adrian Monk: Here's what happened. Three weeks ago, Magneri went in for a checkup. You were the lab tech
on duty. You must have noticed something on his X-rays. Something serious. Something that could kill him.
Natalie: It was the ultimate piece of inside information.
Captain Stottlemeyer: Literally inside.
Adrian Monk: Peter Magneri is Magneri Computers. You knew if anything happened to him, the stock would plummet. All you had to do was switch X-rays and put a different label on it. Magneri got a clean bill of health. Nobody knew how sick he really was, not him, not even his doctor. But you knew. You quit your job and started selling short, betting against the company. When Magneri died and the stock crashed, you'd make a small fortune. At some point, Vickie found out. Maybe you were looking for a partner. Maybe you were just bragging. But Vickie wasn't like you. She couldn't just sit back and do nothing and wait for another human being to die. She tried to warn Magneri. You knew you had to stop her by any means necessary. That night, Vickie told Magneri it was a matter of life or death. She was talking about him. His life or death.
Captain Stottlemeyer: You chased her down. You killed her on the beach and you took back the X-ray.
Arlene Boras: That's insane. You don't have any-
Natalie: Proof? Mr. Monk found this. It was hidden behind your toilet.
Adrian Monk: Behind your toilet!

Arlene Boras: I don't know what she was thinking. I was even going to share the money with her.
Captain Stottlemeyer: Tell that to Vickie's family. You're under arrest.
Adrian Monk: You understand if anything happens to Magneri, anything that could've been prevented, it'll be two counts of murder.
Natalie: How bad is it?
Arlene Boras: That spot? It's called an aortic aneurysm. He's a heart attack waiting to happen. Any excitement, any stress at all, could kill him.
Adrian Monk: Oh, my God. The zoning board.