Roxanna Brown, the director of the Southeast Asian Ceramics Museum at Bangkok University, in Thailand, was found dead Wednesday at the Federal Detention Center in Seattle, where she was being held in connection with an investigation into looted art, reports The Seattle Times.

Ms. Brown, 62, was arrested last week in Seattle, where she was scheduled to speak at the University of Washington. She was indicted in Los Angeles on one count of wire fraud for allegedly allowing her signature to be used on appraisals of donated works; the appraisals were allegedly inflated so that the donors could claim higher tax deductions, the newspaper reports.

Ms. Brown’s brother, Fred Brown, told the Associated Press that she apparently had a heart attack. She was in a wheelchair after having lost her leg in 1980 and had been suffering from flu-like symptoms.