Federal, state and local authorities pieced together a week-long mystery. A tip from a homeless man led to the discovery of the mass murderer that shot up Brown University, and later killed a prominent nuclear physicist at MIT. Although investigators were quick to say the murders were unrelated, we’ve been putting the pieces together on the Bob Rose Show. Are there more surprises? More ties, to possible foreign enemies? Perspective on the dead killer, and all the morning’s biggest stories for 12-19-25