Robert 'Bob' Berdella, owner of Bob's Bizarre Bazaar in the Westport Flea Market, Kansas City, Missouri was a serial killer dubbed "The Kansas City Butcher" and "The Collector". Kidnapped, tortured, raped and dismembered at least six men between 1984 and 1987.
 
Steak knife recovered from the home of Berdella. There's a cover for the blade looks to be a manila folder or cardstock.
Evidence tape has also been affixed to the knife.
 
Obtained from the Del Dunmire estate in Harrisonville, MO.