applause tonight on the streets of boston, pent-up pride and fear, relief, a lot of people very, very happy tonight. people chanting, usa, for the arrest of the second suspect. the only surviving suspect in the boston marathon bombing that claimed three lives the day of the bombing. forever altered the lives of so many more, claimed the life of a police officer just last night. the second of two brothers, the second of two boston marathon bombing suspects is in custody. 19-year-o 19-year-old, chechnyan american, his older brother killed last night in a shoot-out with police in watertown, about 20 minutes west of where i m standing. now their flight from justice included the alleged murder of a police officer in cambridge. a carjacking, chase, bomb throwing. tonight it ended, a younger suspect cornered in a back yard