LINCOLN, Neb. (AP) — A grand jury will not indict anyone in connection to the killings of two Nebraska inmates during a prison riot.

The Johnson County jury found on April 19 that there was not enough evidence to file charges in the May 10, 2015 killings of Donald Peacock and Shon Collins.

The pair were found dead in their cells after a prisoner uprising at the Tecumseh State Correctional Institution. Both men were serving time for sexual assault convictions and died of blunt force trauma to the head.

Johnson County Attorney Rick Smith told the Omaha World-Herald that the investigation into the killings continues and the jury’s decision does not mean no one will be charged in the future.