Horror struck a commercial jet more than 5 miles off the ground as shrapnel from an apparent blown engine smashed a window, damaged the fuselage and left passengers praying for their lives — a lethal mid-flight accident that left one dead and seven others injured, according to authorities.The woman who was killed was identified last night as Jennifer Riordan, 43, of Albuquerque, N.M., a banking executive with Wells Fargo and a married mother of two.