The Walking Dead Season 4 SPOILERS: Executive Producer David Alpert Reveals Season 4 Details in Q&A

Season 4 of the AMC hit "The Walking Dead" is fast approaching and more details about the new episodes have surfaced.

Executive Producer David Alpert revealed plenty of information to AMC in a Q&A session, and here are some of the highlights:

"Q: If Season 3 was about the human threat, what would you say Season 4 will be about?

A: What we really have here in Season 4 is we dangle the carrot that civilization can be rebuilt...The notion that there's civilization and the notion that there's the possibility of there being laws and a sense of normalcy. I think we're going to see an evolution in the walkers - there's a whole bunch of new walkers - and we'll see an evolution of the threat of human-on-human. Dangling the possibility of civilization will make people much more desperate and willing to do things that would have previously been unthinkable.

Q: What's been the toughest character for you personally to lose from the show?

A: The great thing about this show is that literally every character is on the table... We have no one that is untouchable... One of the hardest things was killing Shane. In the comic, it happened much, much earlier, and Robert had said he wanted to give that character a little bit more space to breathe. So trying to figure out what was the right place to kill Shane was really difficult... In the screening room here in production, there's a wall that says 'Our Grateful Dead,' and it's got pictures of all the characters who've been killed off over the seasons. It's kind of insane: One, it's kind of touching, and, two, we've killed a lot of people on this show. [Laughs] It's hard to say which one was the toughest.

Q: Are you planning to add any characters to that wall in Season 4?

A: Oh, there's going to be a whole bunch of people added to the wall."

Season 4 of "The Walking Dead" premieres on Oct. 13, 2013.