The Tombstone Epitaph newspaper(1880 thru 1899) is
available to view at the genealogybank.com database
online(subscription required) There are seventy nine
mentions/articles of/about policeman Dave Neagle in the
Tombstone Epitaph alone,many more hits in All the
Arizona newspapers at that database.

Early Tucson,Phoenix and Prescott newspapers are
also available at that source. Neagle shows up in those
newspapers as well. Keyword search engine
works well,remember to play with the spelling,ie
Nagle/Neagle/Neagls Some public libraries carry the
database and make it available to cardholders. Good database! covers all US states.