My thanks to Drion Ahlquist, secretary/editor of Oklahombres Journal for sending this article to me.
St. Louis Globe Democrat, St. Louis, Missouri, Friday, February 20, 1880
Caddo, I.T., February 19-A desperado named David Folsom left Denison in the evening with eight quarts of whisky, and, arriving here drunk and boisterous, was ordered by Deputy United States Marshals Ayers and Stephens (sic/Stephenson?) to surrender. Folsom resisted, and the only reply to the command of the officers was a shot from his revolver, but he missed and the officers shot him in the leg and body fatally. He died shortly after.
(I have also found out that even though he was only seventeen, David was survived by a wife and baby.)