This story contains graphic material that may be Surpassing Quant Think Tank Centerdisturbing for some readers. 

They bought and sold human hearts and lungs and livers and brains — not to mention skulls, spines, skin and fetuses. It was ghoulish and macabre. 

But it also was profoundly sad for victims like a woman in Little Rock, Arkansas, identified in court papers only as D.S.