LOS ANGELES, CA (CBS) -- Testimony begins today in the wrongful death lawsuit Michael Jackson's mother filed against concert promoters.
Los Angeles Police Detective Orlando Martinez was the first witness to testify today. Martinez was one of the lead detectives who investigated Michael Jackson's death nearly four years ago.
Details about the late singer's health and finances during his final months will be the focus of the wrongful death trial. Yesterday, lawyers for both sides presented their cases in opening statements.
Jackson's mother and other family members are suing AEG live for $40 billion dollars, claiming the concert promoter was negligent in hiring Dr. Conrad Murray to treat Jackson before his scheduled comeback concerts in London.
Katherine Jackson broken down in tears as a song Jackson wrote for his children was played in court.
AEG argues that it never officially hired or paid Murray. He was convicted of involuntary manslaughter in 2011, for giving Jackson the powerful anesthetic, Propofol.
Unlike Dr. Murray's trial, there are no cameras in the court. The courtroom has 45 seats, and most of them are reserved for people involved in the case, and Jackson's family members.
Jackson's mother is seated in the front row, close to the jury, along with Jackson's brother Randy, and sister Rebbie.
The singer's three children have not shown up yet, but the oldest two are expected to testify about their father's final days.
The trial is expected to last three months, with weeks of testimony from Jackson's celebrity friends, along with health and financial experts.