Updated

A former Marine has pleaded not guilty to killing the pregnant wife of another Marine.

The Desert Sun of Palm Springs (http://desert.sn/1onV9Bk ) says 24-year-old Christopher Lee entered the plea Tuesday to first-degree murder with a special allegation of lying in wait.

Lee was arrested in Alaska on Aug. 17 after the body of 19-year-old Erin Corwin was found down a 100-foot mine shaft near Joshua Tree in the Mojave Desert. The Tennessee native went missing June 28.

Prosecutors say that Corwin and the married Lee were lovers. Her husband, Cpl. Jonathan Corwin, and Lee were both stationed at the Twentynine Palms Marine base.

Authorities say bullet casings and rebar found near Corwin link Lee to the killing.