Ex-Marine Christopher Lee was arrested Sunday night in the killing of Erin Corwin, a Marine wife who was found crumpled at the bottom of a 140-foot mine shaft in a remote desert area of Southern California.

Authorities have also said that Lee’s wife, Nichole Lee, is a “person of interest” in the death.

Corwin’s body was located Saturday afternoon by specialized mine search teams, who used cameras to explore more than 100 mine shafts and bodies of water in the remote desert, police said Monday. An urban search and rescue team recovered the body on Sunday, and dental records were used to ensure it was Corwin.

The mine was on federal land, a few miles southeast of Twentynine Palms, outside of Joshua Tree National Park, in the desert east of Los Angeles.

A warrant for Lee’s arrest was issued after the body was found. An autopsy confirmed that Corwin was the victim of a homicide, but the cause of death has not been released.