Sienna Raine Johnson (born October 30th, 1999) ^[1] is a 16-year old Colorado teen suspected of planning an attack against at Mountain Vista High School in Highlands Ranch, Colorado. Entries in a journal mention 'NBK' a reference to the 1994 Oliver Stone movie Natural Born Killers. She is known to have bought a BB gun and was found in possession of a map of the school. No evidence of harming animals or pets has been presented. ^{[undefined] [undefined]}

Details of the planned attack have been sealed pending investigation.

The plot was uncovered on Dec 12 2015 when someone submitted an anonymous tip.

A hearing has been scheduled on Jan 13 2016 to determine if the court documents should be unsealed for public viewing; she has been charged as an adult.

Her Public Defender has a scheduled court date to request the case be moved back to juvenile court.

The lawyer also stated that the prosecutions statements are "grossly exaggerated."

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He parents divorced when she was two, and she moved to various states such as South Carolina, Pennsylvania, and Florida.

With her dad in South Carolina remarrying, she moved back to Colorado when she was 9, where she was "passed" between her father, mother, and grandparents.

She has since lived with her mother.

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