At 5.20 PM today, the celebrity gossip website TMZ.com reported that Michael Jackson had suffered a major cardiac arrest this afternoon in his LA-area home. Reports indicate that Jackson had stopped breathing by the time paramedics arrived.

Jackson was set to embark upon an ambitious world tour. No word yet on how (or if) those who had already purchased the rather expensive tickets will be reimbursed.

This is all (somewhat) breaking news, and we’ll try to keep you updated on any major new developments.

For the time being, suffice to say R.I.P. to one of the most important, successful, influential and controversial figures in pop music history.

EDIT: The LA Times has confirmed that Jackson is indeed dead.