worshippers filled new england's largest roman catholic church this morning. reflecting on the violence in boston that began nearly a week ago. ♪ members of law enforcement took part in the service at the cathedral of the holy cross. four large photos of people who were killed were prominently displayed behind four lit candles. cardinal o'malley said, in the midst of the darkness of this tragedy, we turn to the light of jesus christ. ♪ ♪