A popular pun about cartoonists (from a hypothetical newspaper headline) is:
 
“Cartoonist found dead in home. Details are sketchy.”
 
The joke was on the website Pun of the Day and posted on Twitter on May 19, 2009. The pun has also been printed on GIFs.
 
   
Twitter
M.McG
‏@meggily11
cartoonist found dead in her home.  details are sketchy.
7:36 AM - 19 May 2009
 
Twitter
Mary Dobbs
‏@mamatygress
Pun of the Day
“Cartoonist found dead in home. Details are sketchy.”
7:53 AM - 19 May 2009
 
Twitter
punoftheday
‏@punoftheday
Cartoonist found dead in home. Details are sketchy http://www.punoftheday.com/pun/3330
8:05 AM - 19 May 2009
   
Google Books
The Mammoth Book of One-Liners
By Geoff Tibballs
London: Constable & Robinson Ltd
2012
Pg. ?:
Did you hear about the cartoonist who was found dead in his home? Details are sketchy.
 
Google Books
All Kinds of Humor:
Jokes, Quips, and Fun Stuff for Many Occasions
By Frank Verano
Xlibris Corporation (Xlibris.com)
2012
Pg. 207:
Cartoonist found dead in home. Details are sketchy.
   
Google Books
Chuckle, Giggle, Snort!:
Quips Collected By Karen Money Williams
By Karen Money Williams
Lulu Press, Inc. (Lulu.com)
2013
Pg. ?:
Cartoonist found dead in home. Details are sketchy.