One of the key links in the chain of people and event that made up the Boston Marathon Bombing is now dead. He was partly responsible for getting Dzokhar the gun that killed Sean Collier and fired on Sgt. Pugliesi. Why was he still walking around? Find out on this (bonus) episode of Mayhem.
Be sure to subscribe on your preferred podcast app, and on instagram @mayhemmcphee to stay abreast of my latest investigations.