CNN affiliate KTLA reports that Jackson was rushed to the hospital after paramedics responded to a call from his home around 12:26 p.m. He was not breathing and paramedics had to perform CPR on him.
It looks like a Jackson family member has also told TMZ that Jackson is in "really bad shape" and that his brothers are headed to the medical center. His father, Joe Jackson, told E! News, "He had a heart attack. He is not okay. His mother is on her way to the hospital now to check on him." [KTLA; TMZ via Brooklyn Vegan, E! Online]
Update: Now TMZ is reporting that Jackson is dead. Major news outlets have yet to confirm this news, but there is a possibility that it could be true. More to come. [TMZ]