The Mueller family are residents of Gotham City.
Ben Mueller joined the GCPD and investigated The Ogre after Julie Kemble's death at the hands of the Ogre. His wife was killed soon after by the same person who killed Kemble, leading Mueller to drop the case and scratch out a vital piece of information. Mueller was later questioned by detectives Jim Gordon and Harvey Bullock about the Ogre and he revealed some information he had discovered. Mueller's wife was avenged by the two detectives when the Ogre was shot dead by them.