https://thewalkingdeadfanclub.blogspot.com/2011/12/rutina-wesley-as-michonne.html
"We have received word from one of our sources that a certain actress from A show called true blood will be playing Michonne in the Walking Dead TV series, scheduled to make her debut on the very last episode of season 2."
*****
https://www.tvline.com/2011/11/walking-dead-quit-season-2/
"How’s your vision today? Good? Good, ’cause you’re gonna wanna be 20/20 or better for today’s Blind Item. It concerns one of the stars of AMC’s The Walking Dead and their desire to… well, walk.
The backstage drama all started when series creator Frank Darabont was ousted. A whole lotta people were upset, you’ll recall, and this one person, so much so that he/she asked to be released from his/her contract. But, according to my moles, a funny thing happened between the time the request was made and when it was potentially granted.
A change of heart.
Now this member of the ensemble wants to stay. But it may be too late. (Even my sources don’t know for sure at this point whether the character is going to be written off, although one insider insists he/she ultimately got their wish.)"
Rumor is Jeffrey DeMunn aka Dale ( veteran of Shawshank, Green Mile, Mist, Majestic) is the actor getting written out.