Madge is a villainous bank teller at West Bay Trust Bank. She was the first of the tellers interviewed by Leland Stottlemeyer after the bank was robbed, with Madge claiming that the robber was a heavily-accented Russian wearing a green hooded sweatshirt. After Monk and Natalie get a lead, they meet Stottlemeyer and Disher at the bank, where Madge lets them in. Once Monk explains what he's figured out, Madge let him and the others in the vault to continue his investigation. While Madge is gone, Monk notices something in the otherwise empty wastebasket: six toothpicks, one shorter than the others. With that, Monk solves the case, and yells that they need to get out, immediately. At that moment, however, Madge turned heel and closed the door of the vault, sealing the four of them in.
As Monk later revealed, the villainous Madge played a role in the robbery; in fact, she was the Russian. The tellers and bank manager Peter Crawley all colluded together, with Madge being the one who shot Jasmine, after Jasmine drew the short straw as the one who has to be shot to make it look good. Madge, along with the rest of the villainous tellers, was arrested for robbery