A Topeka man serving a life sentence for killing a Topeka police officer has died in prison.

The Kansas Department of Corrections says that 32-year-old Ross Preston Lane was found unresponsive in his cell at the El Dorado Correctional Facility on Dec. 24. He was pronounced dead later that morning.

Lane pleaded guilty to capital murder in the death of police Cpl. Jason Harwood, a 15-year veteran of the Topeka Police Department who was fatally shot Sept. 7, 2014, during a traffic stop in East Topeka.

Lane had been incarcerated in the El Dorado prison since Aug. 3.

The Kansas Bureau of Investigation was notified of Lane’s death and is conducting an investigation.

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Information from: The Topeka (Kan.) Capital-Journal, http://www.cjonline.com.