Katherine Jackson's multi-billion dollar lawsuit against concert promoters AEG Live over the death of her son, Michael Jackson, begins today. 

Katherine is suing AEG Live for 40-billion dollars, claiming the company is liable for Michael's death because they hired Dr. Conrad Murray to care for Michael as he geared up for his "This Is It" comeback concert series in 2009.  Murray was later convicted of involuntary manslaughter in 2011 for giving the pop star a deadly dose of sedatives.  He is currently serving a four year prison sentence.  

While AEG Live's attorneys claim that the pop star chose Murray as his personal doctor, lawyers for Jackson claim they have e-mail evidence showing that wasn't exactly the case.  The e-mail in question reportedly shows a conversation between AEG Live co-CEO Paul Gongaware and the "This Is It" director Kenny Ortega.  Just 11 days before Jackson's death, Gongaware pointed out to Ortega that AEG is paying Murray's salary, not Michael Jackson.  Even if that was case, lawyers for the concert promoter also argue that Michael had a drug abuse problem well before he signed on with the company.