Kelsey Berreth, Patrick Frazee

Krystal Lee, a registered nurse who allegedly disposed of a cell phone belonging to her boyfriend's missing fiancee, has been fired from her job.

Lee, 32, is set to appear in a Colorado courtroom on Friday to plead guilty to at least one count in the disappearance of Kelsey Berreth, a 29-year-old pilot and mom-of-one (pictured above).

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