`` We wanted some additional information , '' chief investigator Ed Winter said . Coroner had said it completed `` thorough '' report into Michael Jackson 's death . The coroner has been asked to review the case again and make a final determination on what happened that night in June 2009. Dr. Arnold Klein , Jackson 's dermatologist , has denied giving him dangerous drugs .
`` We wanted some additional information , '' chief investigator Ed Winter said . Coroner had said it completed `` thorough '' report into Michael Jackson 's death . Winter would not say what prompted the second visit or its conclusions . Dr. Arnold Klein , Jackson 's dermatologist , has denied giving him dangerous drugs .