Authorities in New England are investigating the brutal assassination of a Massachusetts Institute of Technology nuclear science and physics professor who was gunned down in his own home, Us Weekly has learned. Law enforcement sources confirm Portugal native Nuno F.G. Loureiro, 48, died on Tuesday, December 18, after being shot the night before. Police started getting calls about gunshots from Loureiro's neighbors around 8:30 p.m. on Monday, December 16.