2015 has barely started, and we've already lost some amazing people. I don't remember them all, so please list them if they've had a forum topic attributed to them.
Kitty0706 / Colin Wyckoff
Spock / Leonard Nimoy
Phlack's Best Friend
Monty Oum
Draven Rodriguez
Rally's liver
Maxis
Bob Simon
Scott Stoked of Element Animation.
Mike Ey
Windell Middlebrooks
Radioshack Soon...
Terry Pratchett (Author)
Shinji Ogawa
XR-7's Grandmother
Alyx Vance's Cousin
Trollboat's Great Grandmother
Sam Simon
Jem Marsh
Tuti Yusupova
Misao Okawa
Thorfin25 (Godspeed, you magnificent bastard!)
Perro Aguayo Jr.
SBG's cat, Pudding
Grooveshark
Ben E. King
Enjoyedben2002's cat
And some others... (Please let me know so that I may add them to the list.)