Erin Corwin, 19, went missing more than four weeks ago, and since that time, mystery has continued to surround the pregnant Marine wife's disappearance.
A spokesperson for the San Bernardino County (Calif.) Sheriff's Department says:
"We have a responsibility to conduct a thorough investigation to determine if she's a victim of foul play or if she's voluntarily missing. She has not been located."
Questions surround the nature of her relationship with her husband, Marine Cpl. Jon Corwin, and her neighbor, former Marine Cpl. Christopher Lee.
Erin Coriwn and her husband had been living on base in Twentynine Palms, Calif.
They had been there less than a year when, in an effort to make new friends, they started hanging out with their neighbors Christopher and Nichole Lee.
The friendship ended as quickly as it started, according to People's cover story.