The fiancée of the worker who died at a metro Atlanta USPS facility is speaking out after coworkers shared troubling allegations about conditions inside the building. Demarcus Little Sr., 45, died at the Palmetto Regional Processing and Distribution Center on June 3. His fiancée, Laura Wheaton, told Atlanta Black Star she still has more questions than answers about what happened. “I talked to Demarcus on his lunch break, and he was perfectly fin…