On July 1, NBC Dateline aired “Missing Marie”, a bizarre case about a defense worker Marie Singleton in southern California who was secretly working for the CIA also, back in 1994, and disappeared (on Nov. 11). also here.
The killer would turn out to be her own husband, for motives unrelated to her work. He was arrested as a fugitive in Arizona in 2008, and convicted and sentenced in early 2012 (CBS LA story).
The case stands in comparison to 2008 slayings of Powell and Green, still unsolved, possibly related to defense work.