Michael Jackson's daughter reportedly wants to "tear Conrad Murray apart" when she testifies in her family's wrongful death suit against AEG Live.
Paris Jackson's grandmother Katherine Jackson has accused the firm of negligent behaviour leading to the King of Pop's 2009 death.
The suit alleges executives pressured the popstar to perform for a final series of comeback concerts.
Court documents allege the concert promoters were also negligent by hiring and supervising Jackson's former physician Murray, who was convicted of involuntary manslaughter in Michael's death.
Paris, 15, is believed to have already been deposed by the defence.
The teenager is said to have been composed while answering intrusive questions about her family life.
Apparently the ordeal hasn't swayed her from testifying. She is said to be looking forward to blasting the former physician before the court.
"Paris wants to kick Murray's butt," a source told UK newspaper The Sun.
"She wants him to explain what pressure he was under to make Michael perform. When she gives evidence she plans to tear him apart."
Murray has been serving a four-year sentence in Los Angeles County Jail since November 2011.
Jackson also leaves behind sons Prince, 16, and Blanket, 11.
AEG deny any wrongdoing.
- Cover Media