I am checking  David Siegel and J Randolph Cox's book on Flashgun Casey.  Here is their take on names:

Program debuted on July 7, 1943 as "Flash-Gun Casey press Photographer"
On April 8, 1944 it became "Casey, Press Photographer"
By July 4, 1945 title was shortened to "Crime Photographer"
March 29, 1947 the title "Casey, Crime Photographer" came into existence and remained the official title until the programs end on November 16, 1950.

When Casey returned to the airwaves in 1954, title reverted back to "Crime Photographer".

Archie