Actor Powers Boothe, known for his roles in "Sin City," "Agents of S.H.I.E.L.D," and "Deadwood," has died at 68, his publicist, Karen Samfilippo, said.

The Emmy-winning actor passed away Sunday of natural causes in his sleep at his Los Angeles home.

A private service will be held in his home state of Texas, Samfilippo said.

His family is also considering a memorial celebration in his honor for a future date.

Boothe is well known for his villain roles and Westerns. He played a key role in the HBO series "Deadwood" as saloon owner Cy Tolliver.

In 1980, Boothe's leading role in the TV movie "Guyana Tragedy: The Story of Jim Jones" earned him an Emmy for "outstanding lead actor in a limited series or special."

He accepted his Emmy in person unlike many nominees and presenters who boycotted the event as part of a Screen Actors Guild strike.

"This is either the most courageous moment of my careers or the stupidest," he said while accepting the award, TIME magazine reported.

More recently, Boothe starred as Senator Roark in the "Sin City" franchise and as Gideon Malick on Marvel's "Agents of S.H.I.E.L.D."

Friends and colleagues took on Twitter to express his condolences for Boothe's passing.

"It's with great sadness that I mourn the passing of my friend Powers Boothe. A dear friend, great actor, devoted father and husband," actor Beau Bridges wrote.

Boothe's co-star in the 1984 war film "Red Dawn," actress Lea Thompson remembered the actor.

"I loved acting with you #PowersBoothe you were a gentlemen and a great actor," she wrote.

In 2009, Boothe was inducted in the Texas Film Hall of Fame along with actor and singer Billy Bob Thornton.