Second teenager pleads guilty to plot to shoot up high school

Two teenagers have confessed to a plot to shoot up their Colorado high school.

According to KDVR, Sienna Johnson reached a plea agreement with the Douglas County District Attorney's Office on Wednesday.

When they were only 16, Johnson and her friend Brooke Higgins planned an attack to kill their classmates and teachers at Mountain Vista High School in December of 2015.

"My goal is for the public to understand how this happened, why it happened and what are the consequences," says District Attorney George Brauchler, KDVR reports. "This was not a couple of kids that said, 'What if?' This was more than that and we're treating it like more than that."

Johnson pled guilty to an adult charge of felony menacing and a juvenile charge of conspiracy to commit first-degree murder with a sentence enhancer of a violent juvenile offender.

Higgins agreed to a similar deal, pleading guilty to conspiracy to commit first-degree murder, (an adult charge) and murder solicitation in the first degree (a juvenile charge).

Higgins' felony will go away if she stays out of trouble -- if she doesn't, she will face 8 to 24 years in adult prison. Johnson, however, will remain a convicted felon no matter what.

"(Johnson's family) were willing to take a felony conviction to get out from under the potential for 8 to 24 years (in prison)," Brauchler told KDVR.

The DA says that this plea deal will protect the public but allow the teenagers to be rehabilitated.

"At the end of the day, I have great hope these girls will end up growing up to be responsible, law-abiding members of society, that pose a risk to no one," Brachler said, according to KDVR. "We cannot say that today. That's why we put this particular sentence in place."

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