Police said Clark and Devins met online on Instagram and grew close. Devins had a large online following and was especially well-known in the gaming community. It was on the Discord social app for gamers where Clark posted photos of Devins' body, police say.
Last month Clark was charged with first-degree promoting prison contraband after corrections officers allegedly found a sharpened toothbrush in Clark's possession during a cell search in December. That charge was dropped, however, as part of Clark's guilty plea, the Utica Observer-Dispatch reports.
Clark is scheduled for sentencing April 6. He faces a possible sentence of 25 years to life in prison.