NORTH BROOKFIELD, MA (WHDH) — A man convicted of raping his karate students was arrested after police found him teaching students in North Brookfield.

David Sanderson, 60 of Barre, was arrested for failing to register as a sex offender.

He was convicted on six counts of child rape in 1991 and sentenced to 20 years in prison.

Police received reports he was teaching under the name Grand Master Doshi.

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