Anyone who has tuned into The Walking Dead over the past three seasons will likely know that Rick (Andrew Lincoln) and his group dispose of zombie corpses by burning them. AMC has released a new trailer for the upcoming Season 4 that shows the whole group watching a pile of walkers burn in the prison yard. In the past, these zombie bonfires were quite routine, but why is the whole group circled around the fire this time? Find out when the series returns Sunday, October 13 at 9 PM ET with "30 Days Without an Accident".