Elizabeth Santos Lopez, 28, was last seen July 7, 2012, near Falfurrias, Texas after crossing the border at Matamoros, Mexico and traveling with a group toward Falfurrias. She called her husband from New Brunswick, Texas and told him the group planned to walk the rest of the way. During the trek she became ill and could not continue walking.

The group reportedly left Elizabeth near a petroleum refinery and two ranches in the Falfurrias area. Despite searches, she has not been seen since and her disappearance remains unresolved; her case is registered with NamUs and family and law enforcement continue to seek information.

Key unanswered questions include what happened to Elizabeth after she lost consciousness and who, if anyone, last saw or assisted her near the refinery and ranches. Anyone with information about her movements in that area on July 7, 2012, is asked to come forward.