Katherine Jackson: Michael's mother, 82, was deposed for nine hours over three days by AEG Live lawyers. As the guardian of her son's three children, she is a plaintiff in the wrongful death lawsuit against the company that promoted Michael Jackson's comeback concerts.
Kenny Ortega: He was chosen by Michael Jackson and AEG Live to direct and choreograph the "This Is It" shows. Ortega, who choreographed for Jackson's "Dangerous" and "HIStory" tours, testified at Dr. Conrad Murray's criminal trial that "Jackson was frail" at a rehearsal days before his death.
Dr. Conrad Murray: He was Michael Jackson's personal physician in the two months before his death, giving him nightly infusions of the surgical anesthetic that the coroner ruled led to his death. Murray, who is appealing his involuntary manslaughter conviction, has sworn that he would invoke his Fifth Amendment protection from self-incrimination and refused to testify in the civil trial. There is a chance that Murray will be brought into court from jail to testify outside the presence of the jury to allow the judge to determine if he would be ordered to testify.
Joe Jackson: Michael's father, 84, is on the witness list for the trial and may testify. The Jackson family patriarch, who lives in Las Vegas separately from his wife, has suffered several ministrokes in the last year, which some close to him say have affected him.
Prince Jackson: Michael's oldest son is considered a key witness in the Jacksons' case against AEG Live, since he is expected to testify about what his father told him about the concert promoter in the last days of his life. Prince, who turned 16 in February, is becoming more independent -- he now has a driver's license and jobs.
Paris Jackson: Michael's daughter, who turned 15 on April 3, is on the list of witnesses and was questioned by AEG Live lawyers for several hours on March 21 about her father's death. Paris is an outspoken teen who often posts messages to her 1 million-plus Twitter followers.
Blanket Jackson: Although AEG Live asked the judge to order Blanket, 11, to sit for a deposition, and he is one of the four plaintiffs suing them, Michael's youngest son will not be a witness in the trial. His doctor submitted a note to the court saying it would be "medically detrimental" to the child.
Randy Phillips: He's president of AEG Live, the concert promoter that contracted with Michael Jackson for his "This Is It" comeback shows set to start in London in July 2009. The Jackson lawsuit says Phillips supervised Dr. Conrad Murray's treatment of Jackson in the weeks before his death, making the company liable for damages. E-mails between Phillips and other executives showed they were worried about Jackson's missed rehearsals and sought Murray's help getting him ready.
Kevin Boyle: The Los Angeles personal injury lawyer is leading the Jackson team of at least six attorneys in the wrongful death suit against AEG Live. One of his notable cases was a large settlement with Boeing on behalf of two soldiers injured when their helicopter malfunctioned and crashed in Iraq.
Perry Sanders, Jr.: Katherine Jackson's personal lawyer is helping steer the Jackson matriarch through her relations with her son's estate, probate court and the wrongful death suit. He is also known for representing the family of Biggie Smalls in their suit against the city of Los Angeles over the rapper's death investigation.
Marvin Putnam: He's the lead lawyer for AEG Live, defending against the wrongful death suit. The primary focus of his legal practice is "media in defense of their First Amendment rights," according to his official biography.
Philip Anschutz: The billionaire owner of AEG, parent company of AEG Live, is on the Jacksons' witness list. He is the force behind the effort to build a football stadium in downtown Los Angeles to lure a National Football League team to the city. He recently pulled his company off the market after trying to sell it for $8 billion.
Tim Leiweke: He was recently fired as AEG's president as Philip Anschutz announced he was taking a more active role in the company. The Jackson lawyers say Leiweke's e-mail exchanges with executives under him concerning Michael Jackson's health are important evidence in their case.
Paul Gongaware: The AEG Live co-CEO worked closely with Michael Jackson as he prepared for his comeback concerts. He testified at Dr. Conrad Murray's criminal trial that he contacted the physician and negotiated his hiring at the request of Jackson. AEG lawyers say it was Jackson who chose, hired and supervised Murray. Gongaware knew Jackson well, having been tour manager for the singer in previous years.
John Branca: He's one of two executors of Michael Jackson's estate. Branca was Jackson's lawyer until about seven years before his death. He said Jackson rehired him just weeks before he died.
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
Key players in Jackson wrongful death trial
STORY HIGHLIGHTS
- NEW: Expert saw no evidence Jackson ever sought or used illegal drugs
- NEW: No evidence Jackson used more painkillers than doctors prescribed, expert testifies
- Jackson's mom and children contend AEG Live is liable in the singer's death
- AEG Live argues it could not have known about Jackson's propofol use
Los Angeles (CNN) -- A drug addiction expert who testified that Michael Jackson suffered a "quite extensive" drug addiction acknowledged there was no evidence the singer used more painkillers than medically necessary.
Dr. Petros Levounis testified Tuesday and Wednesday for AEG Live in its defense of the wrongful death lawsuit filed by Jackson's mother and children.
Lawyers for the concert promoter want to convince jurors that the singer was a secretive addict responsible for his own death from an overdose of the surgical anesthetic propofol. Their executives had no way of knowing the singer was in danger when he was preparing for his comeback concerts in 2009, they contend.
Jackson lawyers contend AEG Live executives are liable because they negligently hired, retained or supervised the doctor who used propofol to treat Jackson's insomnia as he prepared for his comeback concerts during the last two months of his life.
The conclusion that Jackson was dependent on painkillers was not a revelation, considering Jackson himself announced it when he cut his "Dangerous" tour short to enter a rehab program in 1993.
"If he announced it to the world it's not very private, is it?" Jackson lawyer Michael Koskoff asked Levounis.
"At that moment, he was not secretive," Levounis replied.
Jackson's drugs of choice were opioids, painkillers given to him by doctors repairing scalp injuries suffered in a fire and during cosmetic procedures to make him look younger, Levounis testified.
Labeling Jackson an addict could tarnish the singer's image among jurors, but its relevance to AEG Live's liability is questionable. Opioids played no role in Jackson's death, according to the Los Angeles County coroner. His June 25, 2009, death was ruled a result of an overdose of propofol.
Dr. Conrad Murray told investigators he infused the singer with propofol for 60 consecutive nights to treat his insomnia so he could rest for rehearsals. The judge would not allow Levounis to testify if he thought Jackson was addicted to propofol.
Anesthesiologist: Jackson recruited me to help with insomnia
Levounis said addiction happens when a chemical "hijacks the pleasure-reward pathways" in your brain. "You remain addicted for the rest of your life," Levounis testified.
"Michael Jackson's addiction was quite extensive and I have very little doubt that his pleasure-reward pathways had been hijacked and he suffered from addiction," he said.
Levounis conceded he saw no evidence that Jackson used painkillers after he left rehab in 1993 until 2001 or between July 2003 and late 2008.
He said it is not inconsistent for an addiction to go into remission.
Under cross examination Wednesday morning, Levounis conceded that he never saw evidence that Jackson injected himself with narcotics, ever sought or used illegal drugs such as cocaine, meth or heroin, or abused drugs to produce euphoria or get high.
There was also no evidence Jackson used more painkillers than doctors prescribed, he said.
Jackson lawyers have never disputed the singer's drug dependence. In fact, they contend that AEG Live executives, including one who was Jackson's tour manager when he entered rehab, were negligent for paying a doctor $150,000 a month just to treat Jackson. The high salary created a conflict for the debt-ridden Murray, making it difficult for him to say no to Jackson's demands for drugs.
Paul Gongaware, the AEG Live co-CEO who was in charge of Jackson's 2009 "This Is It" tour, was also tour manager for his "Dangerous" tour in 1993. Levounis acknowledged in testimony Wednesday that there was evidence that Gongaware knew about Jackson's painkiller addiction 15 years before his death.
Levounis' testimony about the dangers of a doctor being too friendly with an addicted patient, which he said Murray was, could help the Jacksons' case.
"A very close friendship between an addicted patient and a doctor is problematic," Levounis testified. "It makes it much easier for a patient to ask for drugs and it makes it more difficult for a provider to resist."
The medical records of Murray's treatment of Jackson between 2006 and 2008 -- when the singer lived in Las Vegas -- showed no painkillers prescribed during seven visits. Murray's notes did show he treated Jackson's complaints of insomnia with a sedative in 2008.
Wednesday was the 76th day of testimony in the trial, which is expected to conclude near the end of September.