The details of Hendrix 's last day and death are widely disputed .
He spent much of September 17 , 1970 , in London with Monika Dannemann , the only witness to his final hours .
Although the details of Hendrix 's last day and death are widely disputed , he spent much of September 17 , 1970 , in London with Monika Dannemann , the only witness to his final hours .