In the pony express when was the rider that was killed?

The Pony Express had only one recorded fatality among its riders, which occurred in 1860. The rider, named William "Billy" S. H. (or "Billy") was killed on September 10, 1861, during a robbery attempt in Nebraska. Despite the dangers faced, the Pony Express operated for only a brief period, from April 1860 to October 1861, delivering mail across the western United States.