Michael Jackson was busy putting on the final touches for his 50-date London concerts at the O2 Arena when he unexpectedly died. Now, ET's Thea Andrews is with the men behind the massive production to reveal what could have been Michael's most incredible concert tour yet!

A show filled with music, dance, stunts and pyrotechnics, Michael's "This is It" concert was being directed by Kenny Ortega, the man who designed Michael's "Dangerous" tour, choreographed 'Dirty Dancing' and also brought "High School Musical" to the world. Kenny says that Michael promised "the concert of a lifetime" and was prepared to deliver.

"We [had] some fun things planned," he says, referring to gigantic spiders, 20-foot puppets, a flaming bed, a pole dancing aerialist, a 3D movie and plenty more magic. "It's complex in scale and it's as big as anything I've ever done or attempted to do for an arena production."

California Attorney General Jerry Brown has joined the police investigation into Michael Jackson's death. Read on to find out why.

Brown says his office will assist police in determining whether prescription drugs had anything to do with Michael Jackson's death, says the Associated Press. Brown says key information could be provided by a records search of the state database that keeps track of doctors who’ve written drug prescriptions, the amount of the drugs prescribed, and the patients who’ve received them.

On Wednesday night, a federal law-enforcement source told ET that the Drug Enforcement Administration (DEA) had also joined the investigation.

The concert promoter behind Michael Jackson's canceled 50-date concert series says its multi-million dollar losses might be covered by insurance, depending on Jackson's cause of death.

Randy Phillips, the chief executive of AEG Live, the concert promoter, tells the Associated Press that insurance will help pay for the losses on Jackson’s canceled residence at London’s O2 arena if the King of Pop’s death is ruled accidental -- even if by drug overdose – not if, however, Jackson passed away due to natural causes.

Phillips says AEG Live acquired $17.5 million in insurance coverage via Lloyd’s of London. But the company spent $25 million to $30 million in advance money for production costs and to Jackson and his staff, covering expenses that included Jackson’s debts and the rent on his L.A. mansion.

A source close to the Jacksons says it was difficult to keep family on message because the siblings aren't that close.

No more amusement park or petting zoo — mostly a sense of calm at ranch.

OK! magazine reportedly paid $500,000 for the “last� picture of Jackson — which shows him lying on a stretcher, possibly already dead — and put the image on the cover.