As the head of one of MIT’s largest laboratories, he oversaw more than 250 researchers working across seven buildings. His goal was simple but world-changing: to harness the power of the stars here on Earth.

But on a quiet Monday night in Brookline, Massachusetts, the man who spent his life studying magnetic reconnection and fusion turbulence was stepped into a shadow he couldn't see coming.

At 8:33 p.m., the doorbell rang repeatedly at Loureiro’s apartment.

His twelve-year-old daughter went to check the door. Her father, sensing something was wrong, intervened and told her to stay back. As he stepped into the shared foyer, the silence of the building was shattered by three to six gunshots.