LOS ANGELES (Reuters) - Michael Jackson's personal physician told investigators he was not the first doctor to give the pop star propofol, the powerful anesthetic that was one of the drugs to cause his death, according to court papers unsealed on Friday. Dr. Conrad Murray, a target of the criminal probe into Jackson's death, recounted under questioning by a Los Angeles police detective that Jackson told him he was given propofol by two unnamed doctors in Germany, the affidavit states.