Defense set to call final witnesses.
Defense attorneys in Dr. Conrad Murray's involuntary manslaughter trial began questioning their final two witnesses Thursday.
The first, addiction specialist Dr. Robert Waldman, said Michael Jackson appeared to be addicted to the pain killer Demerol - a drug he was getting from his dermatologist.
Waldman suggested withdrawal from the Demerol caused crippling insomnia, and that when Dr. Murray gave his own cocktail of drugs to the singer he didn't know Jackson was a demerol addict.
The prosecution said Waldman was speculating at best.
Propofol expert Dr. Paul White is the final defense witness.
His testimony is meant to establish reasonable doubt for the jury: That it's possible Jackson gave himself the fatal dose of the anesthetic.
The scientific testimony follows emotional testimony Wednesday from former patients of Dr. Murray who passionately defended the physician.
Whether Jackson gave himself Propofol or not, the prosecution contends Murray is still ultimately responsible for a patient in his care.
There could be one more witness in this case: Dr. Murray himself.
The judge gave him until the end of the defense's case to decide whether he wants to take the stand.