John Warren Geils Jr. was found dead in his Groton, Massachusetts home, according to ABC Boston affiliate WCVB.
Geils formed the Boston-based band in the 1960s as an acoustic blues trio. They later added singer Peter Wolf and became more blues-rock oriented, signing their first record deal in 1970.
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The group hit its peak of popularity in 1981 with its more pop-oriented album Freeze Frame, which hit No. 1 led by the singles "Centerfold," "Freeze Frame" and "Angel in Blue."
The band broke up in 1985 and Geils turned to other interests, including auto racing.
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