Some say it was the grueling concert schedule that killed Michael Jackson; others, the influence of addiction-enabling handlers. Could there be a connection? The New York Times reports that the LAPD is investigating correspondences between Jacko's personal physician, Conrad Murray, and Anschutz Entertainment Group, which was organizing the King of Pop's final concert series in London. The LAPD is one of several agencies participating in the sprawling investigation of Dr. Murray and seven other doctors. The federal Drug Enforcement Administration is also participating, and documents filed this week in Nevada included "shipping orders, distribution lists, use records relating to the purchase, transfer, receiving, ordering, delivery and storage of Propofol." Search warrants list 19 aliases that Mr. Jackson allegedly used to acquire illegal prescriptions.