Charles Cullen is an American serial killer who was employed as a nurse and murdered dozens, perhaps hundreds of patients. 8" x 10" double sided handwritten letter hand dated December 14, 2019, hand signed, Charles. Includes the original mailing envelope postmarked Trenton, NJ, April 16, 2020. The envelope is completely written by Cullen including his complete return address, hand signed, C. Cullen.