"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VRTB-JVZ : 17 May 2020), Richard Helzer in household of Frank Helzer, Tract 30, Portland, Portland City Election Precinct 330, Multnomah, Oregon, United States; citing enumeration district (ED) 37-439, sheet 1B, line 60, family 23, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3392.
"United States Social Security Death Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:V3T7-5ZG : 6 January 2021), Richard H Helzer, 30 Jun 2006; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find a Grave, database and images (https://www.findagrave.com : accessed 11 January 2021), memorial page for Richard Henry “Dick” Helzer (8 Feb 1940–30 Jun 2006), Find A Grave: Memorial #52918631, ; Maintained by Marko (contributor 46556579) Cremated, Location of ashes is unknown.