|Michael O'Hare as Jeffrey Sinclair
The show's creator, J. Michael Straczynski, posted on his Facebook page Friday that O'Hare, who had been in a coma since suffering a heart attack on Sept. 23, had died at age 60.
Sci-fi fans will forever remember O'Hare for landing his role as Sinclair, military governor of space station Babylon 5 - mankind's "last, best hope for peace." In one of the more bizarre casting changes on television, Sinclair and Straczynski parted ways after a single season. O'Hare, however, would return to make guest appearances on the program.
In season two, Capt. John Sheridan (Bruce Boxleitner) replaced Sinclair for the remainder of the show's five-year run.