MOORESVILLE, Ind. —

An Indiana teenager accused of planning a mass school shooting has agreed to a plea deal.

Court documents say 18-year-old Trinity Shockley pleaded guilty to conspiracy to commit murder, which is a level 2 felony.

Police received an anonymous tip in February that Shockley was planning a shooting at Mooresville High School on Valentine's Day. Mooresville is southwest of Indianapolis.

As part of the plea agreement, Shockley would be sentenced to 20 years in prison.

The deal still has to be accepted by a judge.

Shockley's sentencing hearing is set for November.

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