Mona Lisa Two Eagle, a member of the Rosebud Sioux Tribe reported by secondary sources to have been 19 years old and the mother of two children, was last seen on February 3, 1979, leaving the family home on the Rosebud Indian Reservation near Rosebud, South Dakota. According to published accounts, her 12-year-old brother, Phil Two Eagle, told investigators he saw her leave the home and get into a red-and-white pickup truck occupied by two men whose identities were never publicly established. She was not seen alive again.
Approximately two weeks later, her father and brother located her body in a field near the family home. Published secondary accounts describe her as having been beaten and possibly sexually assaulted before her death; an official cause-of-death finding has not been published in any source reviewed for this package. At the time of disappearance she was described as 5 feet 2 inches tall, approximately 160 pounds, with black hair and brown eyes.
No arrest has ever been made in the case, and no individual has been publicly named as a suspect or charged. Local and tribal authorities investigated at the time; contemporary secondary sources characterize the original investigation as limited, though no official case file or department report was reviewed to confirm that characterization. Secondary reporting also describes unresolved witness accounts of a vehicle parked near the field where the remains were found and of two men reportedly carrying a person into a nearby house around the time of the disappearance; these leads were never publicly resolved and did not result in any identification or charge.
The case is one of several Rosebud Reservation cases that received renewed national attention following the 2017 murder of Savanna LaFontaine-Greywind and the 2020 enactment of Savanna's Act, and has since been featured in Missing and Murdered Indigenous Persons (MMIP) awareness reporting, including a 2023 "We Are Resilient" podcast episode. The case is currently tracked by the Bureau of Indian Affairs Office of Justice Services (BIA OJS) Missing and Murdered Unit, with case agent Savannah Peterson listed of record. It remains unsolved. Anyone with information is asked to contact the BIA OJS Missing and Murdered Unit at 1-833-560-2065, or the BIA OJS Headquarters, 1849 C Street NW, MS-3662-MIB, Washington, DC 20240.
