Michael Jackson's eldest son Prince -- an eyewitness to the horrific scene in the bedroom where his father lost his life -- does not want to testify in the Conrad Murray trial, but he's telling family he'll do what needs to be done to get justice for his departed dad.

Sources close to Prince tell TMZ ... the 14-year-old is "nervous" and worried that if he's called to the stand he might get flustered and "mess up."

We're told if Prince is called by prosecutors ... Katherine will ask her lawyers to request that the entire courtroom be cleared during his testimony. Judge Michael Pastor almost certainly will prohibit the media from training a camera on Prince, but it's unlikely he'll clear the courtroom.

As we previously reported, Prince is on the prosecution's witness list, since Dr. Murray summoned Prince to the bedroom for help during the emergency. When Prince arrived, he dissolved into tears.

The trial starts today. We'll be livestreaming opening statements.

David Walgren -- Prosecutor's Opening Statement
Updated 9/27/11 at 9:35 AM

Prosecutor David Walgren delivered an opening statement, using a graphic of what appears to be Michael Jackson's body on a gurney.

* Michael Jackson trusted his life to the medical skills of Dr. Murray and it was "misplaced trust"
* The cause of death was an overdose of Propofol, administered by Dr. Murray
* We will prove Conrad Murray repeatedly acted with gross negligence and incompetence
* Walgren explained that Murray would obtain $150,000 a month, not the $5 million Murray demanded for the duration of the "This is It" tour.
* Murray made arrangements with a pharmacy to purchase very large quantities of Propofol on a regular basis
* Murray lied to the pharmacist by saying he had a clinic in Santa Monica when he did not
* On May 10, 2009, Murray made a voice recording on his iPhone ... the recording documents MJ highly under the influence of "unknown agents" with Murray sitting there. It shows Murray knew Michael's state and what he was doing to the singer

* In the weeks before MJ died, he was cold, shivering, rambling but Murray kept giving him Propofol, and Kenny Ortega will testify MJ was clearly not well
* A meeting was held at Michael's house on May 20, 2009, MJ died, with Kenny Ortega, Murray, MJ and others. Murray scolded Ortega for expressing concerns about his health, saying he was the doctor, adding, "Michael is physically and emotionally fine. I am the doctor."
* On the day MJ died, at 1 AM, MJ came home from rehearsal and Murray spent the night at the house -- as he did every night for the prior 2 1/2 months -- for the purpose of putting him to sleep with Propofol.
* Walgren acknowledged what TMZ has been reporting almost from the beginning ... that Michael died in his bed -- that he was clinically dead when paramedics arrived.
* Murray was texting and making phone calls while he sat by MJ. He made 8 phone calls, the last at 11:51 to a girlfriend, and that's when Murray realized there was an emergency.
* Murray calls bodyguard Alberto Alvarez and says Michael Jackson had a "bad reaction."
* Murray instructs Alvarez to essentially hide the evidence in a blue bag ... putting, among other things, the Propofol bottle that was hanging on the IV stand -- Walgren is implying that's the bottle that had the fatal dose
* 911 was called at 12:20. And, Walgren says, when paramedics arrived, MJ was dead
* Murray never told the EMTs he gave MJ Propofol, even though they asked what drugs Murray had administered
* Paramedics pronounced MJ dead, but Murray insisted he be transported to UCLA
* UCLA doctors asked Murray what drugs had he given MJ, but Murray never mentioned Propofol
* Two days after MJ's death, Murray met with LAPD detectives, and disclosed he was giving MJ nightly doses of Propofol everyday for more than 2 months to put him to sleep. This is the first time Murray fessed up.
* MJ told Murray at around 5 AM that he needed to sleep and they agreed Propofol was the answer. Murray said he gave MJ 25 milligrams of Propofol, but that would only put him to sleep for minutes. Prosecutors say much more Propofol was administered.

* Murray explained to cops he went to the bathroom to urinate, came back 2 minutes later to discover MJ wasn't breathing. Prosecutors says that is called "ABANDONMENT," leaving a patient unattended is medical abandonment.
* The prosecutor says Murray was on the phone for 45 minutes after giving MJ Propofol
* Conrad Murray acted with gross negligence and was not acting in MJ's best interests ... he was working for $150,000 a month.

Ed Chernoff -- Defense Attorney's Opening Statement
Updated 9/27/11 at 11:00 AM

Dr. Conrad Murray's attorney Ed Chernoff told the jury Michael Jackson caused his own death.

* Chernoff says the evidence will show MJ swallowed 8, 2 mg pills of Lorazepam.
* And Chernoff says MJ self-injected a dose or Propofol that created a "perfect storm" that killed him.
* There was no way to save MJ. He died instantly.
* Chernoff told the jury what TMZ has reported for the last year -- that the centerpiece of the defense case is that Michael's death is on Michael -- not Dr. Murray.
* Chernoff also said MJ "had a problem" that no amount of determination could overcome, even with his talent, and without help he could not do the "This Is It" tour -- a tour that would score him more money than he had ever made on tour before.
* So, Chernoff says, Michael went doctor shopping.
* Dr. Murray is not a "celebrity doctor" -- he's a cardiologist who saves lives.
* The defense will put some of Dr. Murray's patients on the stand to show his level of care. He would buy prescriptions for people who couldn't afford it and would generally go well above the standard of care expected of a doctor -- which contradicts prosecutors who call him greedy and reckless. Murray seemed to tear up as he listened to Chernoff.

* Murray treated MJ for several problems, including toe fungus and a broken foot.
* Chernoff said Murray had no idea at the time that MJ had a much deeper problem
* MJ didn't have insomnia -- he had "an absolute, total and thorough inability to sleep."
* When Murray met with detectives 2 days after MJ's death, he thoroughly answered every question. It was no holds barred and they hid nothing. Chernoff said Murray told cops, "I don't know what killed Michael Jackson. I want to know also."
* Michael Jackson told Murray the only way he could sleep was with Propofol and he always took Propofol. MJ told Murray exactly how it was to be administered. He even had a nickname for the drug -- milk. MJ knew Lidocaine was essential in administering Propofol to prevent a burning sensation.
* MJ told Murray he would use Propofol with or without Murray, so Murray then agreed to provide Propofol.
* Dr. Murray provided Propofol for 2 months for MJ, and during that time the singer slept, woke up, and lived his life -- suggesting it wasn't negligent to administer the drug.
* The evidence is going to show is that Michael Jackson died when Dr. Murray stopped. Murray told cops he believed his role was to find a way to help MJ sleep normally, urging him to get off Propofol.
* In other words, Murray was trying to ween MJ off Propofol and give him other, more traditional sedatives. And, on June 22, 3 days before MJ died, Michael agreed to let Murray to try to get him off Propofol. And on that day Murray gave MJ half the Propofol he had been giving him. And it worked. MJ slept.
* On June 23, Murray gave MJ NO Propofol at all, giving him other drugs instead. And, on the day MJ died, the plan was not to give Propofol. It was to go to other sedatives. That's why in the recording,MJ pleads for the Propofol. That's why Murray gave him other drugs instead during the night.
* Chernoff says MJ had certain "personality traits." He kept various people in life separate from one another.
* Chernoff will present an addiction specialist, who will testify DR. ARNOLD KLEIN ADDICTED MICHAEL JACKSON TO DEMEROL.
* Things were so serious 5 days before Michael Jackson died, reps from AEG and others had a meeting at MJ's house and talked about "pulling the plug" on the tour. And subsequently MJ made it clear to Murray -- he needed to sleep or the tour would go down in flames.
* Chernoff insists Murray only gave MJ 25 milligrams of Propofol just before MJ died -- and that is not enough to kill him. Chernoff says MJ went to sleep, and Murray checked his pulse -- which was good.
Murray then sat and watched and left the room "only when I felt comfortable." This may be the key to the case -- did Murray abandon MJ by leaving the room?
* Chernoff says when Murray left the room "there was zero Propofol in his [Michael's] system." Of course, what Chernoff is arguing is that Michael then shot himself up with the fatal dose.
* Chernoff came back from break the defense will show the amounts that Dr. Murray's death could not cause Michael's death.
* The science will prove there had to be more Propofol delivered to MJ's system after Dr. Murray left the room.
*The defense says MJ's stomach content had 4 times the amount of Lorazepam than in his blood, which means Michael would had to swallow the drug himself, after Murray left the room.

You heard the opening statements -- now as the testimony fires up, we gotta ask ...

It begins ... Dr. Conrad Murray just rolled up to the L.A. criminal courthouse with his massive entourage, looking sedate in a gray pinstripe suit.

Katherine, Joe, and Jermaine Jackson arrived moments later. All that's missing is a red carpet.