The scribe is planning a Volume Zero of the zombie title, revealing the origin of the plague and providing background information on the characters, TV Guide reports.
Full plot details were not revealed, though the prequel is said to reveal how the characters Shane and Lori went from "grieving friends to lovers". AMC's Walking Dead television adaptation will also address the matter with a flashback episode in its upcoming second season.
Walking Dead was first published by Image in 2003. It was co-created by Kirkman and artist Tony Moore, who was replaced as interior illustrator by Charlie Adlard from issue #7 onwards.
The television adaptation debuted on October 31, 2010. The second season airs later this year on AMC in the US and FX in the UK.
A potential released date for The Walking Dead Volume Zero is yet to be announced.