“What hired killer never goes to jail?”/“The exterminator.”

A riddle about a building exterminator is:
   
Q: What hired killer never goes to jail?
A: The exterminator.
 
The joke has been cited in print since at least 1976.
 
         
Google Books
Biggest Riddle Book in the World
By Joseph Rosenbloom
Illustrations by Joyce Behr
New York, NY: Sterling Publishing Company, Inc.
1976
Pg. 66:
What hired killer never goes to jail?
The exterminator.
     
3 July 1980, Marshfield (WI) News-Herald, “Riddles,” Weekend sec., pg. 7, col. 1:
What hired killer never goes to jail?
The exterminator.
 
2 Funny 4 U
Category: Criminal jokes
Date Added: 11/10/2007
Joke: What hired killer never goes to jail?The exterminator.
 
Twitter
Sylvia Saucedo‏
@Sylvia_shyangel
R U ready? Q: What hired killer never goes to jail? A: The Exterminator Get it ?Ok that’s enough for today I’ll writemore when I’m on again.
4:28 AM - 6 May 2009
 
21 January 2010, McClatchy-Tribune News Service (Washington, DC), “Mini ha-has”:
What hired killer never goes to jail?
An exterminator.
 
Facebook
Daily Joke
December 22, 2011 ·
What hired killer never goes to jail? The exterminator. Please LIKE and SHARE!
 
Twitter
Lucky Score‏
@LuckyScoreNet
What hired killer never goes to jail?
The
exterminator.
#Joke from #CriminalJokes in #Jokes, #Humor and #Satire
1:15 PM - 15 Nov 2017