Powers Boothe, a veteran character actor, died Sunday at the age of 68 -- a few weeks shy of his 69th birthday.

Actor and friend Beau Bridges was first to release the news via Twitter:

The late actor's publicist confirmed the death to TVLine.

Booth, who passed away in his sleep Sunday morning, is arguably best known for his role on HBO's "Deadwood," where he played saloon owner Cy Tolliver.

His distinguished feature film and TV career included big-screen roles in "Tombstone," "Frailty," directed by the late Bill Paxton, and "The Avengers."

The latter role he would reprise on ABC's "Agents of SHIELD."