The wife of a Marine who vanished nearly one month ago had suffered a miscarriage a few months before her disappearance, a close friend said. She was pregnant again at the time she was reported missing, according to police.
Police said Erin Corwin was last seen on June 28 before telling her husband she was going on a hike in Joshua Tree National Park. She did not return home that evening and her husband, Jonathan, called police the next day.
Authorities are investigating the possibility that Corwin was having an affair with her married neighbor and was pregnant with his child, according to a police search warrant.
The San Bernardino County Sheriff's Office is continuing its investigation, but conversations with a longtime friend of Erin's and a ranch owner that she spent time with in recent months provides a look into her day-to-day life.
Erin, who turned 20 last week while she was still missing, loved riding horses both in California, where she and her husband moved to last year and in her home state of Tennessee.
"She loved her horses and loved her family," her longtime friend Brooke Phillips told ABC News.
Phillips said that she has known Corwin for about eight years and they rode together at East TN Riding Club in Oak Ridge, Tennessee.
"She just always was laughing and having fun and trying to cheer people up," Phillips said.
The pair kept in touch when Corwin and her husband moved to Twentynine Palms, a military base in California's Yucca Valley.
In January, Corwin announced on Facebook that she was pregnant, tagging her husband and accepting friends' congratulations in the comments. Her sister confirmed to ABC News that it was the couple's first child.
Phillips said that she spoke to Corwin about the subsequent miscarriage, though she was not exactly sure when Corwin found out.
"She was really sad about it. She wanted kids. She loves kids and she thought she was really positive about it, like 'Sure, the time will come when I have kids,'" Phillips said.
According to police, that time came soon. The San Bernardino County Sheriff's Department confirmed in news release on Tuesday that she was pregnant when she disappeared.
A search warrant released by the office earlier in the investigation details how they came to suspect that the father of her unborn child may be her neighbor, another Marine named Christopher Lee.
The lengthy probable cause statement was initially released by the sheriff's office but they are now refusing to comment on the findings they included in the report.
The probable cause statement, which was filed in conjunction with a search warrant for a U-Haul truck that was being used by Lee and his wife during the investigation, details how police spoke to a good friend of Corwin's who said that Corwin was having an affair with Lee, and that Corwin "may be pregnant with Lee's child." Lee, who is now a reservist in the Marines, could not be immediately reached for comment by ABC News.
"Erin told [her friend] that Lee was worried if his wife discovered Erin was pregnant, Lee's wife would divorce him and keep him from his child," the probable cause statement reads.
Corwin's sister told ABC News that she had not spoken to her about this second pregnancy before her disappearance.
According to the probable cause statement, a different friend of Corwin's said that Corwin had told her that Lee had planned a "special day together" as a "celebration for Erin's pregnancy" that included a hunting trip.
Investigators went on to say in the official report: "It is highly likely Erin could have been harmed by an unknown firearm."