The Walking Dead Ends Season 3 With Ratings Bang

Access Hollywood
A scene from the Season 3 finale of 'The Walking Dead' -- Gene Page/AMC

"The Walking Dead" closed out with a bang on Sunday night, bringing in its biggest audience in the show's history.

The last episode from departing showrunner Glen Mazzara brought in 12.4 million viewers.

WATCH IT NOW: Norman Reedus Loves Getting Dirty On The Walking Dead

But, the bigger news - 8.1 million of those viewers were in the coveted (to advertisers) 18-49 adults demo.

After the big Season 3 finale, the cast and crew Tweeted out their thanks to the fans.

PHOTOS: 'The Walking Dead': Scenes From Season 3

"Thanks for following #TheWalkingDead journey with us this season. We love you (even if we can't make everyone happy)! XOXO #SeeYouInOctober," Executive Producer Gale Anne Hurd wrote.

Melissa McBride, who plays the show's beloved Carol Tweeted, "#TheWalkingDead Thanks to all for watching the show! & @glenmazzara @GunnerGale @AMC_TV Thank you for an awesome season 3! #momentum."

Steven Yeun, who plays Glenn on the show, also offered his thanks, "Thank you everyone. Much love. Much thanks. Blessed with all your support."

Filming on Season 4, under new showrunner Scott Gimple, begins in Atlanta in May.

-- Jolie Lash

Copyright 2013 by NBC Universal, Inc. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.