Nikki Michelle Alcaraz, 33, was last seen May 6 in Moriarty, New Mexico. She was on a road trip across the country with her partner, Steven Tyler Stratton.
The young woman is 5.6 feet (1.70 meters) tall and weighs 160 pounds (65 kilos) The couple was riding in a black 2013 Jeep Wrangler with Tennessee license plates and a bumper sticker that read Mama Tired. "I'm afraid something happened to them, whether they fought again or crashed their Jeep somewhere," sister laments.