Richard K. Shoopman was an American serial killer and friend of Lawrence Bittaker and Roy Norris prior to the pair having been arrested for their toolbox killer/murder mack killing spree.
Shoopman testified at Bittaker ‘s trial. 
Upper portion of an original mailing envelope postmarked November 23, 2016 on which Shoopman has penned his return address and hand signed, Richard K. Shoopman.A must have for any Bittaker/Norris collection.