Bullets Don't Die — J.A. Johnstone

Jared Tate is an aging U.S. marshal who has saved lives, made enemies, and planted a lot of bad men in hallowed ground. But Tate is in deep trouble, the kind that comes from a troubled mind. Not remembering as much as he wants to, not forgetting as much as he should, Tate has one person to trust. Because the Loner has made Tate's enemies his own, taking on Tate's demons and Tate's fight. In the lawless and violent Kansas territory, a young wanderer and an aging lawman will journey side-by-side one last time - into a fight that will take every bullet they have.