The former chief executive officer at Turning Pharmaceuticals has invoked the Fifth Amendment, refusing to produce documents subpoenaed by a Senate committee investigating drug-pricing practices, NBC News repaired.
Martin Shkreli has refused to cooperate with the Senate investigation after House lawmakers issued a subpoena to compel him to appear at a congressional hearing next Tuesday.
Sen. Susan Collins, R-Maine, said on Twitter that the investigation could be hindered by his refusal to cooperate.
Shkeli was arrested last month in New York and charged with securities fraud and conspiracy. He became notorious after hiking the price of Daraprim, the only approved drug for a rare and sometimes deadly parasitic infection, by 5000 percent.