NEW : A doctor demonstrates IV drips he believes killed Michael Jackson . The coroner said the death was a homicide, but Jackson's family has disputed that. Murray could 've saved Jackson if he was watching him , prosecution expert says . `` It 's just a crazy scenario , '' doctor says of defense theory Jackson gave himself propofol . Murray said he gave Jackson a total of 4 milligrams of lorazepam in two separate doses starting 10 hours before his death . Murray 's lawyers should start their defense Friday .
NEW : A doctor demonstrates IV drips he believes killed Michael Jackson . The coroner said the death was a homicide, but Jackson's family has disputed that. Murray could 've saved Jackson if he was watching him , prosecution expert says . `` It 's just a crazy scenario , '' doctor says of defense theory Jackson gave himself propofol . Murray 's lawyers should start their defense Friday .