Brocius had a number of conflicts with the lawmen of the Earp family, and he was named as one of the individuals who participated in Morgan Earp's assassination. Deputy U.S. Marshal Wyatt Earp and a group of deputies including his brother Warren Earp pursued those they believed responsible for Morgan's death. The Earp posse unexpectedly encountered Curly Bill and other Cowboys on March 24, 1882, at Iron Springs (present-day Mescal Springs). Wyatt killed Curly Bill during the shootout. In his journal written in October 1881, George Parsons referred to Brocius as "Arizona's most famous outlaw".