Dr. Conrad Murray Won't Plea to Michael Jackson Manslaughter

We're told Dr. Murray feels so strongly about his innocence, even a plea with no jail time would be out of the question.

Fact is ... Dr. Murray shouldn't hold his breath, because no plea bargain has been offered and sources tell us the D.A. will not offer one.

As for Murray's defense ... we're told the centerpiece revolves around the fact that only two people were in the room around the time MJ died, and Murray insists he did not administer the fatal dose of Propofol.

The operating theory of Murray's lawyers -- when the Doc left to go to the bathroom, a frustrated MJ woke up and administered the fatal dose himself in a desperate attempt to get some sleep.