Jackson's Doctor behaviour - sinister signs! Does he know something?

Law enforcement sources tells one of the theories they're exploring in Michael Jackson's death is that Dr. Conrad Murray administered Propofol to the singer and then left the room, eventually to return to a dead body.

When paramedics arrived Michael Jackson was found with an IV in his arm, an IV stand nearby along with an empty IV bag and oxygen tank.
Paramedics who arrived on scene admit that Dr. Murray's conduct was "strange" - he was "hard to deal with" and was "getting in the way" of emergency responders.
Then, paramedics wanted to pronounce Jackson dead at the house but Dr. Murray insisted they transport the singer to the hospital.

After doctors at UCLA Medical Center gave up on resuscitation efforts because Jackson was clearly dead -- Dr. Murray continued CPR, which some of the UCLA docs found curious.