More passings I'd never discovered....
Clark Ross, 74 - played an Iotian in the TOS episode 'A Piece of the Action' - 1987.
Len Felbar - played an Ekotian in the TOS episode 'Patterns of Force' - 2003.
Bob Whitney - played a party official in the TOS episode 'Patterns of Force' - 2007.
Chester Hayes, 86 - played the 'sound man' in the TOS episode 'Bread and Circuses' - 2000.
Joe Walls, 86 - played the slave in the TOS episode 'Bread and Circuses' - 2002.
Irene Sale, 69 - Played 'Louise' in the TOS episode 'Miri' - 2008.
John/James Gruzalski/Gruzal, 84 - played 'Don Juan' in the TOS episode 'Shore Leave' - 2022
George Allen, 79 - played an engineer in the TOS episode 'Devil in the Dark' - 2015.
This brings the TOS list to 377 who have passed. One note - In two seasons of TOS that I'd researched, only 5 actors have totally disappeared from the press, media, journals, Hollywood, Imdb, etc... IF they are still living, they would all be 89 and up in age. The oldest actor from TOS still alive is now 100 and about a month.