On April 1, 1878, Brown, Billy the Kid, Jim French, Frank McNab, John Middleton and Fred Waite ambushed and murdered Lincoln County Sheriff William Brady, who was indirectly responsible for the death of Tunstall. Three days later, at the Gunfight at Blazer's Mill, Brown and the Regulators engaged in a gunfight with Buckshot Roberts, another man they believed involved in Tunstall's murder. Roberts received a serious gunshot wound from Charlie Bowdre which later proved to be fatal, but not before he managed to kill the Regulators' nominal leader, Richard M. Brewer. Retreating into proprietor Blazer's office, Roberts continued a prolonged firefight with Brown and the Regulators. He died the next day.