The U.S. Federal Trade Commission is investigating Turing Pharmaceuticals for possible antitrust violations in connection with the company’s decision to hike the price of a life-saving drug by more than 5,000 percent, a lawyer for former Chief Executive Officer Martin Shkreli wrote on Friday. The probe was disclosed in a letter to the U.S. House of Representatives’ Committee on Oversight and Government Reform from Baruch Weiss, Shkreli’s lawyer, as grounds for why his client would not answer questions about drug prices at a Jan. 26 hearing.