Irma Clouse Chavez was 30 when she was last seen on July 3, 1981, in Alpine, Texas. She is described as a Hispanic woman about 5 feet 5 inches tall and 127 pounds, with brown hair and brown eyes. Irma worked at a Minute Mart in Alpine and reportedly told coworkers she planned to drive south to Terlingua for Fourth of July festivities to meet her boyfriend.

About a month after she vanished, her vehicle was found in the Study Butte area, roughly 17 miles from Terlingua, containing personal items reportedly including her purse, checkbook and several credit cards. Accounts do not indicate who drove the car there or when Irma was last with it. Investigators later interviewed her boyfriend, who reportedly provided an alibi and said he had not been expecting her.

Family reference DNA from a brother and sister has been submitted to NamUs (MP50274) to aid future comparisons.

What happened to Irma after she left Alpine remains unknown. If anyone knew Irma, saw her car in the Study Butte or Terlingua area, or has information about her travel that weekend, please come forward.