- Associated Press - Monday, August 18, 2014

SAN BERNARDINO, Calif. (AP) - For nearly two months, Southern California sheriff’s deputies and a legion of volunteers scoured the vast, rough terrain peppered with abandoned mine pits and deep bodies of water where the 19-year-old pregnant wife of a U.S. Marine disappeared.

The search finally ended Saturday when a body was spotted with a video camera 140 feet down a mine shaft on federal land near Twentynine Palms, where she had been living.

In a little more than 24 hours, authorities had recovered and identified the remains of Erin Corwin and arrested her former neighbor and alleged lover, 24-year-old former Marine Christopher Brandon Lee, in Anchorage, Alaska, on suspicion of homicide.

“The manner of death has been determined to be homicide,” San Bernardino County Sheriff John McMahon said Monday, adding that deputies searched many of the 100 mine shafts in a 300 square mile area before zeroing in on the one that contained Corwin.

Corwin, whose husband was stationed in Southern California, was in the early stages of pregnancy when she disappeared on June 28, according to court papers. Her husband, Marine Cpl. Jonathan Corwin, reported her missing the next day.

The investigation grew to focus on Lee, who was the Corwins’ neighbor, according to court papers.

Erin Corwin’s friend told investigators that Corwin and Lee were having an affair and that the unborn child might be Lee’s, the papers show. Corwin told the friend, who lives in Tennessee, that Lee was worried his wife might divorce him and prevent him from spending time with his child if she knew Corwin was pregnant, the affidavit says.

Corwin told her husband when she left that day that she was going to scout out hiking trails in Joshua Tree National Park that she and her mother could explore when her mother visited a few days later. But the friend showed authorities text messages that said Corwin was planning to go on a special hunting trip with Lee the day she disappeared.

“It is highly likely that Erin could have been harmed by an unknown firearm,” investigators wrote in the documents. “Sometime after Erin left with Lee, her phone was deactivated (turned off). Detectives believe if Erin was injured and left at an undisclosed location, she would not (be) able to call for help.”

Two days after Corwin disappeared, investigators found her car abandoned off a road near her home. A single set of footprints led from the driver’s side door and disappeared next to a set of vehicle tracks that matched the tires on Lee’s Jeep. They found 10 spent casings from a .40-caliber gun in the Jeep, the court papers say.

Other evidence was found in the shaft - one of more than 100 in the area - but sheriff’s officials declined to give details.

Authorities also declined to release the exact manner of death and said they could not confirm Corwin’s pregnancy until an autopsy was completed.

Corwin would have been 20 if alive, but authorities say she likely died before her birthday.

Lee told investigators he was not with Corwin that day and had been hunting in Joshua National Park. He told police that although the two had kissed, they had never had intercourse.

The investigation found that Lee and Corwin did have an “intimate relationship” dating back to at least February, San Bernardino County Sheriff’s Sgt. Trevis Newport said.

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