LOS ANGELES , California ( CNN ) -- Michael Jackson 's personal physician , Dr. Conrad Murray , administered a powerful drug that authorities believe killed the singer , a source with knowledge of the investigation confirmed to CNN on Monday . Murray allegedly gave Murray propofol in the 24 hours before death , source says . Source close to family says doctor administered drug believed to have killed singer . Dr. Murray was with Murray on day that he died . Police have interviewed Conrad Murray twice since Jackson 's death .
Murray allegedly gave Murray propofol in the 24 hours before death , source says . Source close to family says doctor administered drug believed to have killed singer . Dr. Murray was with Murray on day that he died . Police have interviewed Conrad Murray twice since Jackson 's death .