The Heroes Elders

In Heroes Episode 204: "Kindness of Strangers", we are shown the picture of a "meeting" of some sort that Nathan finds amongst his belongings in an apartment. The picture contains 12 individuals, some of who have been murdered.





Here's who is known to be in the picture:
1st row (Bottom) Left to Right: Unknown (Mrs. Deveaux?), Charles Deveaux, Unknown person, Unknown male

2nd row (Top) Left to Right: Unknown (Mrs. Linderman?), Mr. Linderman, Mr. Arthur "Dallas" Petrelli, Angela Petrelli, Kaito Nakamura, Matt Parkman's father, Bob (from "The Company")

So far the following individuals in the picture are dead or believed to be deceased:

Charles Deveaux - died of natural causes, Cancer (In season 2, Kaito implies that Charles' death may have been due to foul play, rather than by succumbing to his illness)
Arthur "Dallas" Petrelli - said to have commit suicide
Kaito Nakamura - murdered by mysterious hooded figure, who is stalking them.
Mr. Daniel Linderman - murdered by DL Hawkins (phased his fist into the back of his head)

According to that, just 8 individuals in the picture are considered to still be alive. "Bob" is Suresh' boss at The Company and has the power to turn objects to gold. Matt Parkman's father may be the "nightmare man" who has been haunting Molly Walker and can see her, and also may be the one killing the other elder heroes.