Final answer:
Devil Anse Hatfield is widely held responsible for the murder of Asa Harmon McCoy, who was the first victim of the Hatfield McCoy feud.
Step-by-step explanation:
Asa Harmon McCoy was indeed the first victim of the infamous Hatfield McCoy feud. The murder was widely attributed to Devil Anse Hatfield, the patriarch of the Hatfield family. McCoy was a Union soldier during the Civil War and had fought against the Confederacy, which led to a feud between the Hatfields, who were Confederate sympathizers, and the McCoys, who were Unionists. Devil Anse Hatfield and his group of men ambushed McCoy while he was returning home from the war. They shot him dead, believing McCoy to be a threat to their family honor.