A 20-year-old Missouri woman told police she fatally stabbed a college student with autism after cops found the man’s smoldering remains in her backyard fire pit. Officers then found remains inside a fire pit and a bloody folding pocket knife. Cops also discovered a cell phone matching the description of the victim’s submerged in a sink filled with water. Blood was also found inside a car at the house, inside the home and in the backyard. A piece of missing mattress was burning inside the fire pit. Police said the remains were burned beyond recognition and refrained from identifying the...