The Walking Dead's co-executive producer, Greg Nicotero, has hinted that the show will lose more cast members.

Warning: Spoiler Alert!

The recent third season of the zombie drama has seen two key characters, Lori Grimes (Sarah Wayne Callies) and T-Dog (IronE Singleton), killed off.

Speaking to The Hollywood Reporter, Nicotero said: "We've established a certain scenario on our show where nobody is safe.

"Certainly in the back-half of our season, it doesn't get easy for anybody - we have the whole Woodbury community with the Governor [David Morrissey] and our principal cast."

He added: "We'll probably end our season minus a cast member or two."

The Walking Dead will return to AMC on Sunday, February 10 and on FOX from Friday, February 15.