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.
Last fall, Nichole and Erin, 19, often rode horses at the White Rock Horse Rescue ranch in nearby Yucca Valley. Isabel Megli, the owner, recalls:
"After February, they never came together ... [Nichole] never said a word."
On June 28, Erin, who was nearly two months pregnant, told her husband she was heading to Joshua Tree National Park to check out scenic places
Her mother, who was expected to arrive the following week, wanted to visit there. But Erin never returned home and her husband called police the next day.
Soon, a childhood friend of Erin's forwarded texts to police suggesting Erin and Christopher were having an affair and the baby could possibly be his.
At first, Christopher denied knowing much at all about Erin, but after being questioned again by police, he admitted to kissing Erin but nothing more.
"Lee stated his wife knew he and Erin were becoming too close," according to the affidavit in the case, which is still unfolding with no charges filed.