Houston used cocaine just before drowning in the bathtub , police says . Houston won six Grammys and sold 170 million albums , singles and videos over her career . Narrowed arteries ` ` suggest a cardiac event '' caused her death . Marijuana , Xanax , Flexeril and Benadryl found in her blood played no role , coroner says . Houston died in her room at the Beverly Hilton Hotel a day before the Grammys .
Houston used cocaine just before drowning in the bathtub , police says . Narrowed arteries ` ` suggest a cardiac event '' caused her death . Marijuana , Xanax , Flexeril and Benadryl found in her blood played no role , coroner says . Houston died in her room at the Beverly Hilton Hotel a day before the Grammys .