The Lone Star Ranger by Zane Grey

A thought kept repeating itself to Duane, and it was that he might have spared himself concern through his imagining how awful it would be to kill a man. He had no such feeling now. He had rid the community of a drunken, bragging, quarrelsome cowboy.

When he came to the gate of his home and saw his uncle there with a mettlesome horse, saddled, with canteen, rope, and bags all in place, a subtle shock pervaded his spirit. It had slipped his mind -- the consequence of his act. But sight of the horse and the look of his uncle recalled the fact that he must now become a fugitive. An unreasonable anger took hold of him.