This undated photo released by the San Bernardino County Sheriff's Department shows 19-year-old Erin Corwin, left, with her husband, Jonathan Wayne Corwin, a corporal in the U.S. Marine Corps. Authorities on Wednesday, July 2, 2014, were searching for the missing woman who disappeared after leaving her home on the Twentynine Palms Marine Corps base and was headed to Joshua Tree National Park.

TWENTYNINE PALMS, Calif. - A recently discharged Marine who volunteered at a horse ranch with the missing pregnant wife of another California-based Marine has been arrested on suspicion of possession of a destructive device, authorities said Monday.

But they wouldn't say whether the cases of Christopher Brandon Lee, 24, and Erin Corwin, 20, are connected.

Lee, then a Marine corporal, was arrested July 4 after a search warrant was served at a home in Yucca Valley and then released on bail two days later, the San Bernardino Sheriff's Department said in a statement.

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