"The Walking Dead" season 4 episode 3 titled "Isolation" aired on AMC last night.

The official synopsis for "The Walking Dead" season 4 episodes 3 are as follows:

Episode 3 "Isolation": "A group leaves the prison to search for supplies; the remaining members of the group deal with recent losses."

In the new episode, the survivors face a threat of the common flu, which is proving to be fatal. Many survivors will die as a result of the virus. Patrick became the first character to die from virus and became a zombie.

In last week's episode, prison newcomers Karen and David were murdered after coming down with the flu. Viewers may find out who the killer is in tonight's episode. The murderer can be among a member of the Prison Council or one of the core members.

If you miss the episode on October 27, be sure to watch "The Walking Dead" season 4 episode 3 online via live stream on the AMC website.

The second episode of the Walking dead season 4 pulled in 13.9 million viewers, down slightly from the premiere of 16.1 million viewers. The season premiere and second episode were among the highest ever in the series.

"The Walking Dead" is an American horror drama television series developed by Frank Darabont based on the comic book series by Robert Kirkman, Tony Moore, and Charlie Adlard.

Sneak peak photos of episode 3 have been posted on AMC's website.

Watch a sneak peek preview video of "The Walking Dead" season 4 episode 3 below: