NEW : Doctor was ` ` present during the search of his home , '' attorney says . Investigators search for Conrad Murray 's Las Vegas home , office . Murray allegedly gave Jackson propofol in the 24 hours before death , source says . Chernoff , a Houston lawyer hired by Murray soon after Jackson 's death , confirmed at the time that Los Angeles police detectives and federal DEA agents used a search warrant to enter Murray 's office in northeast Houston on Wednesday morning . Sources close to Jackson says doctor administered drug believed to have killed singer .
NEW : Doctor was ` ` present during the search of his home , '' attorney says . Investigators search for Conrad Murray 's Las Vegas home , office . Murray allegedly gave Jackson propofol in the 24 hours before death , source says . Sources close to Jackson says doctor administered drug believed to have killed singer .