Mary Virginia "Jimmie" Carpenter, a 21-year-old woman from Texarkana, Texas, disappeared in Denton, Texas, on the evening of June 1, 1948. She had traveled by train from Texarkana to enroll in a summer course at Texas State College for Women (TSCW), now Texas Woman's University. On the train she met a fellow enrollee, Marjorie Webster, and after arriving in Denton the two shared a taxi to the college dormitories, driven by a local cab driver. Carpenter realized she had forgotten to retrieve her trunk from the station and had the driver take her back; when the trunk could not be located that night, she arranged for it to be delivered the next morning and returned to Brackenridge Hall around 9:30 p.m. The driver reported that a cream-or-yellow-colored convertible was parked outside with two young men standing nearby, and that Carpenter appeared to know them, walking up and asking what they were doing there. He said she told him to leave her luggage on the ground and drove off; that was the last confirmed sighting of her.
Carpenter's disappearance was not discovered until several days later when her boyfriend could not reach her, prompting her mother, Hazel Carpenter, to learn from TSCW that her daughter had never enrolled. Denton and Texarkana police, Texas Ranger Lewis C. Rigler, and federal agents investigated extensively, including aerial and water searches, but found no substantive leads. Carpenter's trunk was recovered but yielded no clues, and her handbag was never found. The taxi driver took and passed a polygraph test in July 1948, though a decade later his wife told police she had earlier lied about the time he arrived home that night. He was never charged and died in 1984; he has been described as remaining a suspect despite passing two polygraph examinations.
Numerous unconfirmed sightings were reported across Texas, Arkansas, and Louisiana in the months following her disappearance, none of which were substantiated by police. In 1959, human bones found near Jefferson, Texas, initially raised hope they belonged to Carpenter, but dental records did not match. In May 1998, an anonymous tip led Denton police to excavate the TWU campus grounds, but only unrelated debris was found. Carpenter was declared legally dead in 1955, seven years after her disappearance.
Theories about her fate have included running away, elopement, kidnapping, murder, amnesia, and even forced prostitution, though psychiatric consultations reportedly found no indication she had reason to flee. Some speculated a connection to the contemporaneous Texarkana Moonlight Murders, as Carpenter reportedly knew three of the victims, though no evidence has confirmed such a link. Rigler, who investigated the case for decades, concluded she was likely dead, citing the absence of any apparent motive for her to disappear voluntarily. The case remains unsolved and officially open.