Chorao of Brazilian band Charlie Brown Jr

Chorao of Brazilian band Charlie Brown Jr performs on stage during a concert at HSBC Brasil on April 9, 2010 in Sao Paulo, Brazil.

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Police say the vocalist of one of Brazil's most popular rock groups has been found dead in his Sao Paulo apartment.

Inspector Itagiba Vieira tells reporters that Alexandre Magno Abrao's driver found the singer's body sprawled on the apartment's kitchen floor on Wednesday.

The 42-year-old Abrao, known on stage as Chorão, was the lead singer and composer of the Charlie Brown Jr. band.

Vieira says the exact cause of Abrao's death is unknown but "apparently he was not murdered."

He said an "overdose of medicine or some other substance may have killed him."