(HANNIBAL)—One of two men accused of killing a convenience store clerk enters a not guilty plea to second degree murder charges. 30 year old Michael Studer entered the plea Monday morning in the shooting death of 61 year old Adrienne Arnett in the early morning hours of October 8th.  22 year old Gary Wiltermood is also charged with second degree murder in Arnett’s death as she worked at a convenience store at 100 Shinn Lane. Wiltermood told investigators he drove to the gas station and participated in the robbery. Wiltermood’s arraignment is November 18th.