(HARTFORD COURANT) State police plan to release investigative documents related to the 2012 Sandy Hook Elementary School shooting on Friday.

The release of the documents comes more than 12 months after Adam Lanza shot and killed 20 first-graders and six women at the Newtown school. Lanza shot and killed his mother before driving to the school. He killed himself after police arrived.

The release also comes about a month after a summary report based on the documents was released, concluding that Lanza acted alone in planning and carrying out the massacre. The 11-month investigation could not determine a motive in the second-deadliest mass shooting in U.S. history.

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