lRobert Andrew Berdella deceased Missouri serial killer dubbed "The Kansas City Butcher" and "The Collector" who kidnapped, raped, tortured at murdered at least six men between 1984 and 1987.

Texas Instruments TI-1200 electronic calculator which comes in the original box it came in which was taken by police when they entered his home on April 2, 1988 at 4315 Charlotte Street in Kansas City, Missouri.
 
All Berdella items were obtained from the estate of the late Del Dunmire.