MUMBAI, Feb. 14 -- Mauris Noronha, also known as Mauris bhai, who killed Shiv Sena (UBT) leader Abhishek Ghosalkar last week before turning a gun on himself, had picked up shooting skills by watching YouTube videos. It is also believed Noronha was enraged after Ghosalkar had alerted the US Embassy about an alleged rape case, following which Noronha's visa was cancelled....