'Walking Dead' Adds 'Go On' Alum in New Mystery Role 

It seems you are using a browser that isn\'t fully supported and some of our features may not work as intended.

We recommend you use one of the following browsers: Internet Explorer 8, Firefox 3.6, Safari 5 or Chrome 5

'Walking Dead' Adds 'Go On' Alum in New Mystery Role

Tyler James Williams will play a character named Noah

\'Walking Dead\': Does Comics Villain Negan Appear in the Season 5 Trailer?

\'Walking Dead\'s\' Andrew Lincoln Fought for Season 4 Alternate Ending

Details on just whom Williams is playing are being kept under wraps, but

can reveal his character is named Noah. It's unclear which episode Williams will make his debut in or if he'll be around in a guest, recurring or regular capacity.

Photos: 'The Walking Dead's' Most Shocking Deaths

The news comes following weeks of speculation after the actor was spotted on the Atlanta set of

The Noah character does not exist in Robert Kirkman's comics, on which the AMC series is based. The TV adaptation has previously featured a character named Noah — played by Parker Wierling — who was a teenage resident of the Governor-led Woodbury and killed during the camp's battle with Rick and company.

Williams joins a swelling cast that includes

alum Seth Gilliam as comics character Father Gabriel and new series regulars Andrew J. West (Terminusbaddie Gareth), Alanna Masterson (Tara) and Christian Serratos (Rosita).

Williams, who starred on NBC's Matthew Perry comedy

, is repped by Seven Summits Management, Osbrink and Hansen Jacobson.

returns Oct. 12 on AMC. Rewatch the killer season-five trailer here.

View Gallery \'The Walking Dead\'s\' Most Shocking Deaths (Photos)

Toronto: Exclusive Portraits of the Fest\'s Biggest Stars

Broadcast TV's New Shows for 2014-15 Season (Photos)

Broadcast TV's Returning Shows 2014-15 (Photos)

'Red Band Society' Ads Calling Octavia Spencer "Scary Bitch" Pulled After Outcry

'Once Upon a Time' Bosses on Season 4: New Rivalries, Rocky Romances and 'Frozen' Twist