Michael Jackson's mother Katherine is set to return to the witness stand next week (begs16Sep13) as her wrongful death lawsuit against concert promoters AEG Live draws to an end. Defence lawyer Marvin Putnam plans to call the Jackson family matriarch to give evidence in Los Angeles County Superior Court for a second time as he wants to question her about the "absurdity of the damages" she is demanding from AEG amid claims company bosses were responsible for hiring Dr. Conrad Murray as the King of Pop's physician. The medic is currently serving time behind bars after he was convicted of involuntary manslaughter for administering the fatal dose of anaesthetic propofol which caused the superstar's death in 2009 - weeks before he was due to make his live comeback with a string of concerts in London. Katherine Jackson, who is suing along with the singer's three children, is seeking more than $40 billion for loss of future earnings and other damages. She previously testified in July (13), when she broke down on the stand and admitted she had no idea who Murray was when she first heard his name. She also told the court that she did not believe her son had any responsibility for his own death. AEG Live executives maintain Jackson had prescription drug and addiction problems, and that they're not to blame for the King of Pop's demise. Two bosses, Randy Phillips and Paul Gongaware, were excused from the trial earlier this week (09Sep13), after Judge Yvette Palazuelos insisted there was not enough evidence to hold them personally accountable. Defence lawyers are expected to rest their case following the 83 year old's testimony on Monday (16Sep13).