(CNN) -- American actor David Carradine has been found dead, hanging by a nylon rope in a hotel room closet in Bangkok, Thailand, according a Thai police official.

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Carradine, who became famous in the 1970s when he starred as traveling Shaolin monk Kwai Chang Caine in the television series "Kung Fu," was 72.

The rope was believed to be from the hotel room curtains, Bangkok Police Lt. Col. Pirom Chanpirom said.

He said investigators found no sign of forced entry into Carradine's room.

An autopsy was being conducted at a Bangkok hospital, but no results will be available for another day, he said.

Police provided Carradine's family with the same information about their investigation, said Tiffany Smith, Carradine's personal co-manager.

Smith said she was "in complete shock" and that suggestions that Carradine took his own life are unbelievable.

"Knowing David, he would never commit suicide," and his death comes at a time when his "career is on a roll," she said.

Carradine was in Bangkok for filming of the movie "Stretch," being produced by a United Kingdom-based company, she said. He was the only American cast member.

Modern audiences may best know Carradine as "Bill" in Quentin Tarantino's "Kill Bill" films. He earned a 2005 Golden Globe nomination for his role in the second movie in the two-part saga.

His career included more than 100 feature films, two dozen television movies and theater work, according to the Internet Movie Database.

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Carradine made appearances in television series including "Gunsmoke" and "Alfred Hitchcock Presents." His first starring role in a series was as the title character in "Shane" in 1966.

He worked with such directors as Martin Scorsese in "Box Car Bertha" in 1972 and Robert Altman in "The Long Goodbye" in 1973.

Carradine was nominated for a Golden Globe for his role as folk music legend Woody Guthrie in the 1976 movie "Bound For Glory," according to a biography on his official Web site.

His theater career began while he studied drama at San Francisco State College in California.

He later landed roles on Broadway in "The Deputy" and "The Royal Hunt of the Sun."

Carradine, who was married five times and divorced four, is survived by his widow, Annie Bierman, according to People magazine.

He was the son of actor John Carradine, a character actor who had appeared in hundreds of films, plays and television episodes.

"David's career as an artist did not begin on the stage, though some of his early career was on and off Broadway. His earliest work was as a sculptor and painter," Carradine's official Web site says.

The site also includes an "Art Bio" in which the actor opens up about his life.

"I've always had an especially hard time with everything I've tried to do," Carradine wrote.

"I've made it pretty big as an actor in spite of being terminally shy. ... Invariably, I had huge obstacles to overcome in anything I tried. Had to work against my genes to achieve my dreams."