Quote from Adrian Monk in Mr. Monk and the Three Julies
Adrian Monk: I remember this box was here in your living room the day your wife was killed. And I found this piece in the other Julie's townhouse. Lieutenant Disher: It's a perfect fit. George Teeger: I don't understand. What does that prove? Captain Stottlemeyer: It proves that you killed both women, Mr. Teeger. First your wife, then the other Julie. Adrian Monk: You were having an extra-marital sex affair.