2nd Teen Accused In High School Murder Plot Pleads Guilty

DOUGLAS COUNTY, Colo. (CBS4)– The second of two teens accused in a murder plot at their high school pleaded guilty to several charges on Wednesday. Sienna Johnson was charged with making threats against Mountain Vista High School.
Johnson, who is now 17 and was 16 at the time of her arrest, appeared in court on Wednesday. She pleaded guilty to felony menacing, conspiracy to commit murder and being an aggravated juvenile offender.
Sienna Johnson (credit: Mountain Vista High School yearbook