Adrian Monk: Frank, there's a clinic next to the church. They have drugs, they have chemicals. Did you have access to the storage room?
Frank Prager: Uh, I mean, I didn't have key or anything, but it would've been easy enough to break in. I didn't poison anybody. I'm not a killer.
Captain Stottlemeyer: Oh, right. What about our last date in the parking lot 4 months ago?
Frank Prager: I wasn't trying to kill you.
Captain Stottlemeyer: You can't be serious.
Frank Prager: All right. I've thought about it. When I got there, I couldn't. I didn't want to become my brother. The last minute, I decided to send you a message.
Captain Stottlemeyer: A message?
Adrian Monk: Oh, my God. Captain, the pattern. It was M. M for Michael.
Frank Prager: Yeah. It was an M. How could you miss it?
Captain Stottlemeyer: Well, how was I supposed to know that was the letter M? This guy's the best detective in the free world. He didn't know that was an M. What, you couldn't use a spray can like everybody else? Oh, for god's sake, a message.
Frank Prager: I just wanted you to think about what you did. Michael was a good kid who got screwed up.
Captain Stottlemeyer: Wait, you think I don't think about your brother? I think about your brother every damn day of my life. It was him or me. And it still eats me up. I don't need an M on a wall to remember something like that. No cop does. Get him out of here.