NEW YORK (TheStreet) -- McDermott International shares are retreating by 5.46% to $4.85 in afternoon trading on Tuesday, as falling crude prices put pressure on the oil sector today.Industry benchmark Brent Crude for June delivery slipped by 2.14% to $52.09 per barrel on ICE Futures Europe, while light sweet crude for May delivery settled down by 1.99% to $55.26 a barrel on the New York Mercantile Exchange.The slump in crude prices is attributable to the market's anticipation that U.S.