The Silver Dollar Killer by Larry Hill

Publisher’s summary
The Silver Dollar Kille has struck again. The hired killer, who marks his victims by placing a silver dollar under the victim’s head, has killed another innocent rancher. Will Cannon hopes the outlaw gang doing the robbing and killing near silver strike town of Durango, Colorado are the Blackman Gang. The Blackman Gang killed Will’s family in Virginia several years ago and when Will stood over the graves of his loved ones he swore an oath to find and kill Blackman and every member of his gang. Will Cannon leaves his Mora River Ranch and rides alone to face the danger in Durango.