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. Attorneys for Katherine Jackson argued for a new trial before a California appeals court on Thursday Jan. 22, 2015, in her case against concert promoter AEG Live LLC, who she claims should be held liable for her son's death in 2009. (AP Photo/Joel Ryan, File)