NEW DELHI: The Supreme Court on Monday upheld the conviction and life sentence awarded to former RJD MP Shahabuddin and three others for murdering two brothers, Satish and Girish Roshan, in August 2004 in Siwan for refusing to pay extortion money.A third brother, Rajiv Roshan, who was an eyewitness to the gruesome incident in which Shahabuddin's goons allegedly threw acid to kill the two brothers, was shot dead on June 6, 2014, when he was going to depose against Shahabuddin in the trial court despite threats from the don and his henchmen.A bench of Chief Justice Ranjan Gogoi and Justices S K Kaul and K M Joseph had just one question to ask, "Why was Rajiv Roshan shot dead when he was going to depose as an eyewitness before the trial court? Who was the mentor behind the murderous attack?"A team of senior advocates appearing for Shahabuddin tried to divert the issue and sought to advance arguments but the CJI-led bench said, "There is nothing in these appeals and we will not interfere with the High Court judgment." The Supreme Court did not even seek a response from standing counsel Keshav Mohan, who appeared for the Bihar government.On December 9, 2015, a special judge had convicted Shahabuddin and his associates for the murders of the brothers and sentenced them to life imprisonment. On August 30 last year, the high court had upheld their conviction and sentence.