John Ringel is a character featured in Season 6. He is a hardware store owner who murdered his wife, Debbie, and framed Marci's dog, Otto, for it. He kidnapped the dog, drugged it, made a molding incision from Otto's jaw, and after killing Debbie, he used that very incision to make it look like she was mauled. When John realized that Monk and Marci figured it all out, he tried to kill them, wounding Marci in the process. He was immediately arrested by Stottlemeyer and Disher.