Case Details:Donna Marie Larrabee, 16, of Rapid City, South Dakota, was last seen by family on November 17, 1976. Larrabee, an enrolled member of the Cheyenne River Sioux Tribe, was living in Rapid City with her mother and other relatives at the time. She left home intending to travel by bus to California to visit her father; it is not known whether she ever reached her destination, and she has not been seen or heard from since. She is described as a Native American female, 5'6" tall, 120 pounds, with black hair and brown eyes. No clothing description or personal effects have been published in connection with her disappearance.

The disappearance is investigated by the Rapid City Police Department (Case No. 17-211020) and is logged with the National Missing and Unidentified Persons System as NamUs Missing Person Case #MP40010. No suspects, persons of interest, or further sightings have been publicly reported, and the case remains open. Larrabee's case is classified by aggregator organizations as "Endangered Missing" given the length of time she has been gone and the circumstances of her disappearance. She is cited by South Dakota news organizations and advocacy groups among the state's unresolved cases of missing and murdered Indigenous women. Anyone with information is asked to contact the Rapid City Police Department at 605-394-4133 or to submit a tip through NamUs.