(Subject to be updated to add all those that have passed already)
Anton Yelchin (Chekov in "Star Trek", "Star Trek Into Darkness" & "Star Trek Beyond") 1989-2016
William Schallert (Nilz Baris on TOS: "Trouble with Tribbles" & DS9 "Trials and Tribble-ations" & Virani on DS9: "Sanctuary")
Karen Montgomery (Beata in TNG: Angel One) 1949-2015
Tom Towles (Hon-Tihl in DS9: "Dramatis Personae" & Doctor Vatm in ST Voyager: "Rise") 1950-2015
Harve Bennett (Actor, Producer & writer of Star Trek 2: The Wrath of Khan, Star Trek 3: The Search for Spock, Star Trek IV: The Voyage Home, Star Trek V: The Final Frontier) 1930-2015
Bruce Hyde (Lt. Kevin T. Riley in TOS: "The Naked Time" & "The Conscience of the King") 1941-2015
Jason Wingreen (Dr. Linke in TOS: "The Empath") 1920-2015
George Coe (Avel Durken in TNG: "First Contact") 1929-2015
Theodore Bikel (Sergey Rozhenko on TNG & DS9) 1924-2015
Vic Parrin (Tharn in TOS: "Mirror, Mirror) 1916-1989
Yvonne Craig (Marta in TOS:"Whom Gods Destroy") 1937-2015
Terrence Evans (Baltrim in DS9: "Progress, Proka Migdal in DS9: "Cardassians" and Ambassador Treen in VOY: "Nemesis) 1934-2015
Olaf Pooley (a cleric in VOY: "Blink of an Eye") 1914-2015
Meg Wyllie (The Keeper in TOS: "The Cage" & "The Menagerie Part 1", "The Menagerie Part 2") 1917-2002
Liam Sullivan (Parmen in TOS: "Plato's Stepchildren") 1923-1998
Michael Strong (Dr. Roger Korby in TOS: "What Are Little Girls Made Of?") 1924-1980
Jill Ireland (Leila Kalomi in TOS: "This Side of Paradise") 1936-1990
Susan Oliver (Vina in TOS: "The Cage" & "The Menagerie Part 1", "The Menagerie Part 2") 1932-1990
James Gregory (Dr. Tristan Adams in TOS: "Dagger of the Mind") 1911-2002
Charles Napier (Rex Denning in DS9: "LIttle Green Men" & Adam in TOS: "The Way to Eden") 1936-2011
Madlyn Rhue (Marla McGivers in TOS: "Space Seed") 1935-2003
Rhae Andrece (Alice #263 in TOS: "I, Mudd") twin sister to Alyce Andrece, 1936-2009
Frank Overton (Elias Sandoval in TOS: "This Side of Paradise") 1918-1967
Ted Cassidy (Ruk in TOS: "What Are Little Girls Made Of?) 1932-1979
Karen Steele (Eve McHuron in TOS: "Mudd's Women") 1931-1988
Richard Tatro (Android Norman in TOS: "I,Mudd) 1939-1991
Kay Elliot (Stella in TOS: "I.Mudd") 1929-1982
Alyce Andrece (Alice #19 in TOS: "I, Mudd") Twin sister to Rhae Andrece, 1936-2005
Bart LaRue (TOS voices as Trelane's father, Guardian of Forever, Provider 1, Ekosian newscaster, Yarnek, and "Bread and Circuses" announcer)