Russian investigators on Tuesday dropped their investigation into the 2009 death in jail of a whistleblowing attorney whose case led to a crisis in relations between Russia and the United States. The investigators said in a statement they had no evidence that Sergei Magnitsky died from custodians\' beatings at the age of 37 as his family and former US-born employer Bill Browder claim. \"Based on the preliminary investigation\'s results, a decision was taken to end the criminal case due to a lack of evidence of a crime,\" the Investigative Committee said. Magnitsky is currently facing a posthumous trial -- Russia\'s first -- along with Browder into alleged tax evasion. The Russian lawyer was jailed shortly after disclosing an alleged $230-million fraud scheme being run by senior tax and law enforcement authorities. An attorney for Magnitsky\'s mother said he intended to appeal the decision in court.