SEATTLE- The autopsy showed that an indicted director of a Thailand museum died at a federal prison in SeaTac of natural causes.

A spokeswoman for the King County medical examiner's office said Friday that Roxanna Brown died of peritonitis, an infection caused by a perforated gastric ulcer.

The 62-year-old U.S. citizen died early Wednesday at the Federal Detention Center while being held for an investigation.

She was accused of allowing collectors to overstate the value of art donated to several Southern California museums, claiming tax deductions.

Brown was the director of the Southeast Asian Ceramics Museum at Bangkok University in Thailand. She was arrested last week while visiting relatives in Seattle and charged with one count of wire fraud.