CHEYENNE, Wyo. (AP) — A 22-year-old man accused of shooting a 19-year-old man in the head and dumping his body in a Wyoming reservoir has pleaded not guilty to second-degree murder and property destruction.

KGAB-AM reports that Armando Ramirez-Serna, of Cheyenne, entered the plea Friday in Laramie County District Court.

Authorities accuse Ramirez-Serna of shooting Justin Robinson while trying to rob him of a pound of marijuana.

Robinson was found floating face down in a reservoir east of Cheyenne on Nov. 26. Robinson's burnt SUV was found nearby.

Ramirez-Serna's trial has been set for May 14. If convicted of second-degree murder, he could face 20 years to life in prison.

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Information from: KGAB-AM, http://www.kgab.com