Michael Jackson's family can sue the organizers of the London concerts that the pop icon was preparing to perform when he died in June 2009, a US judge ruled Wednesday.A Los Angeles Superior Court judge denied a motion by lawyers for AEG Live to dismiss the case brought by Jackson's family, who allege that the stress the singer was under contributed to his death. "I think the judge is very smart, and this was a great success for the plaintiffs," said Kevin Boyle, a lawyer for the family of Jackson, who died aged 50 of an overdose of a powerful sedative used to help him sleep. The lawsuit was filed last September by his mother Katherine Jackson and his three children, Michael Jr., Paris-Michael Katherine and Prince Michael, also known as Blanket. The family says AEG Live is responsible for decisions taken by Jackson's personal doctor Conrad Murray, who goes on trial in March charged with involuntary manslaughter.It alleges breach of contract, fraud, negligence and infliction of emotional distress, saying Jackson showed signs of being "confused, easily frightened, unable to remember, obsessive and disoriented" in the months before his death