A Chicago middle school principal died Monday during a root canal procedure, according to a report Tuesday from the Chicago Tribune.

An autopsy is scheduled for Tuesday for Georgette Watson, 46, of Skokie, Ill. Authorities believe Watson suffered a heart attack while in the dentist's chair at the offices of Feldman & Feldman DDS.

Watson had been principal of Brentano Math and Science Academy, a Chicago-area kindergarten through 8th grade school, since 2003.

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Watson had been sedated before the procedure, but it was unclear whether she was unconscious or was given local anesthetic, police said. Office staff tried to revive Watson before paramedics arrived but were unsuccessful.

The licenses of Lawrence W. Feldman and Joseph D. Feldman were put on probation in July "due to substandard dental work and failure to maintain records," the Tribune reported. Dentists on probation are allowed to continue practicing with certain restrictions, according to the Illinois Department of Financial and Professional Regulation Web site.