A news report said he was found hanged in his hotel room and was believed to have committed suicide.
Carradine was the star of the 1970s TV series "Kung Fu" who also had a wide-ranging career in the movies. Carradine, along with his brother Keith Carradine, hosted the Wild West Tech series on The History Channel.
A spokesman for the U.S. Embassy confirmed the death of the 72-year-old actor. He said the embassy was informed by Thai authorities that Carradine died either late Wednesday or early Thursday, but he could not provide further details out of consideration for his family.
Mr. Carradine was in Bangkok to shoot a movie and had been staying at the luxury Swissotel Nai Lert Park hotel since Tuesday.
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