By RODNEY HO/ rho@ajc.com, originally filed Wednesday, December 31, 2015

For Rick and his crew, sanctuary has been an illusion. The farm season two. The prison seasons three and four. Now Alexandria appears to be in danger of collapse.

In the latest 30-second "Walking Dead" promo for the upcoming second half of season six beginning February 14, it's clear his group will need to seek new shelter.

"I thought living behind these walls was possible," Rick whispers in the narration. "I was wrong!"

Glenn and Maggie pop up separately with Maggie looking quite anguished. And Rick ends the trailer throwing an ax... at whom?

We'll see how long before Negan, the nasty villain in the "Walking Dead' comics, shows up. Can he be even worse than the Governor - or those cannibals? Jeffrey Dean Morgan will play Negan.

The season wrapped production last month in Senoia. Season seven doesn't begin until the spring of 2016.