there is at least one published report saying the owner was CEO of a research company in north carolina and was the pilot.
sounds like a case of an owner operator of a very light jet, (req only ONE pilot) getting behind the plane.
while icing in descent is an interesting additional factor, you do not slow to an unsafe speed just to follow a C172. You go around, you do S turns, or even a 360 on final.
anyone know the final apch speed for the jet? reports a of a major fire indicate the plane still had fuel on board.