23-year-old lindsay lu and 29-year-old kristin marie campbell. days later on the run after their pictures they ambushed m.i.t. police officer shawn collier shooting him three times in the head and a failed attempt to take his service weapon. tsarnaev borrowed that weapon. it was the same gun used to car jack and terrorize a chinese national who escaped calling 911 as the brothers drove his mercedes suv to watertown. there they engaged with police in a firefight. an officer nearly dying after getting hit by the bullet in the chaos. in boston the jury is holding tsarnaev, the lone suspect responsible for all of it. we know why he it it all, to punish muslims. tsarnaev left a note in the boat where he was captured that reads in part, stop killing our