Production of "The Walking Dead" season 7 is currently ongoing, but some of the show's major characters have reportedly been missing on the set. Some fans speculate that whoever is not being spotted in the filming of the hit series may be the same person that Negan killed in the season 6 finale.

Reports say that at present, the characters who have not been spotted filming for the upcoming season are Michael Cudlitz (Abraham), Josh McDermitt (Eugene), Steven Yeun (Glenn) and Christian Serratos (Rosita).

Some speculate that sooner or later, Abraham, Eugene and Rosita will be called to the set once the filming for the second half of the season begins. However, many believe that the story is different for Glenn.

It may be recalled that Glenn almost got killed in the first episode of season 6 but was fortunate enough to survive. Fans believe that this time around, Glenn may not be able to survive Negan's attack, especially since in the source material of "The Walking Dead" series that goes by the same name, Glenn's character was killed by Lucille.

Another thing that ignites speculations about Glenn's death in season 7 is that Steven Yeun has been absent in "The Walking Dead" panels or conventions of late, unlike Cudlitz who has not been spotted filming but was spotted in a convention recently. However, it was noticeable that his hair was no longer dyed red.

Fans who are negative about the death of Glenn in the season 6 finale take Cudlitz's new hair color as a sign that Abraham could be the one who got killed off and not Glenn.

In other news, Sydney Park and Deborah May are reportedly joining the cast of the upcoming installment of the series.

"The Walking Dead" season 7 premieres in October on AMC.