Michael Jackson's mother Katherine is liable to pay more than $800,000 (£500,000) in trial costs to concert promoters at AEG Live after unsuccessfully suing them for the King of Pop's wrongful death. Katherine Jackson failed to prove AEG executives were responsible for the Thriller hitmaker's 2009 passing after a jury ruled in favour of the entertainment company in October (13). The defendants subsequently asked a judge to bill the Jackson matriarch for their legal fees, which amounted to over $1.2 million (£800,000), but she challenged the fees in papers filed in December (13). AEG bosses have since revised their invoice and on Monday (14Apr14), Los Angeles County Superior Court Judge Yvette Palazuelos issued a tentative decision ordering Jackson to pay up. The ruling will be finalised after AEG executives submit the amended list of costs. Jackson's attorney, Kevin Boyle, is planning to review the final documents before deciding on whether or not to appeal. Katherine still maintains AEG bosses negligently hired Dr. Conrad Murray to care for her son as he prepared for his This Is It concerts in London. Murray was ultimately convicted of killing the singer with a fatal dose of Propofol and he was released in November (13) after spending two years in prison.