FILE - In this March 5, 2009 file photo, US singer Michael Jackson announces that he is set to play a series of comeback concerts at the London O2 Arena in July, which he announced at a press conference at the London O2 Arena. A judge heard arguments on Friday, Jan. 3, 2014, from lawyers for Jackson's mother, Katherine Jackson, who is seeking a new trial in her negligent hiring case against concert promoter AEG Live LLC. Los Angeles Superior Court Judge Yvette Palazuelos did not issue an immediate ruling but indicated in a tentative ruling that she would not grant a new trial. (AP Photo/Joel Ryan, File)