The J. Geils Band with lead guitarist J. Geils performed before a sold-out Bank of America Pavilion in Boston on Aug. 6, 2011. —Robert E. Klein for The Boston Globe

J. Geils, the guitarist who founded the eponymously named The J. Geils Band, was found dead of natural causes late Tuesday afternoon at his home in Groton, according to police.

Groton police responded to a home on Graniteville Road at about 4 p.m. for a well-being check, police said in a statement.

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