UPDATE: Just after 6pm ET, MSNBC, FOXNews, and CNN are being more cautious, reporting only that he is in the hospital.
2D UPDATE: At 6:22pm, CNN reported (citing multiple unnamed sources) that Michael Jackson is in a coma.
3D UPDATE: At 6:25pm, MSNBC says that the LA Times is reporting that Jackson was pronounced dead earlier this afternoon.
4TH UPDATE: At 6:28pm, Fox News said that the LA Times is now reporting that Jackson was in a coma. A minute later, Fox said that the AP — and the LA Times — are reporting that Jackson is dead.