Jackson had been due to start a series of comeback concerts in London on July 13 running until March 2010. The singer, whose hits included "Thriller" and "Billie Jean," had been rehearsing in the Los Angeles area for the past two months.
The shows for the 50 London concerts sold out within minutes of going on sale in March.
His lifetime record sales tally is believed to be around 750 million, which, added to the 13 Grammy Awards he received, makes him one of the most successful entertainers of all time.