Almond Upton, the man found guilty of intentionally running over New York State Trooper Christopher Skinner in 2014, has died in prison.

According to the New York State Department of Corrections website, Upton, 64, died Sunday at Clinton Correctional Facility in Dannemora. He'd been there since late 2016 after being sentenced to life in prison without parole.

Upton was traveling from Florida to Connecticut to see family when, during a manic episode, he hit and killed Skinner. He would later tell investigators the devil made him do it, and after being arrested, he identified himself as Jesus Christ, leading the defense team to pursue an insanity defense. Upton was diagnosed with manic bipolar disorder in 2011.