Michael Jackson's drug addiction likely to have caused his death

Jackson was under enormous stress to perform in the 50 concerts at London O2 centre. He is reported to have told his fans earlier outside his LA studio he was not sure how he will cope with the 50 shows as he originally wanted to do only 10 shows touring around the world.

"I don't know how I'm going to do 50 shows, I'm not a big eater - I need to put some weight on.

"I'm really angry with them [concert promoters] for booking me up to do 50 shows. I only wanted to do 10, and take the tour around the world to other cities, not 50 in one place.

"I went to bed knowing I'd sold 10 dates, and woke up to the news I was booked to do 50," said Jackson reportedly to his fans outside his LA studio.

Jackson fell ill after taking an injection of the potent painkiller Demerol which is suspected to have led to a cardiac arrest.