Arlene Miller is the illegal adoptive mother of Heather Miller. She and her husband Gavin Miller were part of the lynch mob lead by Bart Hartman, which responsbile for the Sawyer Family's death. Gavin and his wife Arlene met their end at the hands of their daughter's cousin Leatherface at their mansion. Arlene is portrayed by actress Sue Rock.
Arlene and her husband Gavin came to the mansion where their daughter was staying in hopes of collecting half the stuff. When they knock on the door they start hearing noises and finally Leatherface comes out with his Chainsaw. No official conformation that they did indeed dead although many fans believe they did.