the walking dead recap

Two questions, in the beginning of the show in black and white Abraham is drinking next to a body that is covered with a sheet, the person is wearing a wedding ring, who is it? If this person is from the previous season I don't remember.

Question 2, who do you think rings the horn or siren at the end of the show, do you think it's Morgan who Rick didn't want to fully trust him in the beginning.

This episode was cap in my opinion.