Marilyn Dunham is the mother of Olivia Dunham in the Prime Universe. She is mentioned several times throughout the series, being a victim of domestic abuse to her second husband. ("The Cure")
Background Information Edit
Marilyn is the biological mother of Olivia Dunham and Rachel Dunham in the Prime Universe. She died of cancer when Olivia was 14 years old. ("Olivia")
Alternate Universe Edit
Marilyn Dunham is the still-living mother of Olivia Dunham (Alternate Universe) and the deceased Rachel Dunham. She is a recurring character on Fringe season 3.