Ron Glass, best known for playing Shepherd Book on the short-lived but acclaimed Joss Whedon series Firefly and its follow-up movie Serenity, has died at the age of 71. No details have been released about his death at this time.
Glass is also known for playing Detective Ron Harris on Barney Miller, a role which got him an Emmy nomination. He also made guest appearances on other shows such as Friends and Marvel's Agents of S.H.I.E.L.D. Shepherd is known for providing the Serenity crew sage advice and wisdom.
Several of Book's Firefly castmates and crew, including Joss Whedon, Nathan Fillion, and Alan Tudyk, said their sweet farewells to Book after learning about his death.