NEW YORK (AP) — A private equity executive turned his New York City apartment into a torture chamber of “grotesque sexual violence,” Manhattan prosecutors said Thursday. He is accused of raping six women over five months in a depraved rampage in which he allegedly punched, waterboarded and shocked victims with a cattle prod and kept recordings of the assaults as trophies. Ryan Hemphill, who remains jailed after his arrest last month, pleaded not guilty to a 116-count indictment charging him with predatory sexual assault and other crimes dating to last October. The 43-year-old, who is also a lawyer, threatened to...