. >> reporter: good morning, to you, maura. right across from me at holy cross cathedral, 11:00 eastern time, there will be a memorial honoring the victims. the president and the first lady will be here. it comes on a day when there's a report of a huge breakthrough in this case, something that could be a turning point, after going through thousands of photographs and surveillance videos. police believe that they have been able to take away one picture of a man in a baseball cap, that nbc news has learned has been distributed to law enforcement agencies. apparently that video, taken on the official cameras. the surveillance cameras, a local department store. show a man acting suspiciously and dropping a bag in the same area as the second bomb. this is the same place where the local tv station, whdh, had the photographs. one showing what seemed to be almost a garbage bag or grocery store bag. and afterwards, the explosion that went off. there is a manhunt on right now to identify that person in the video. we are told that the co

good part of their retirement up there when they weren't spending time with their daughters katie and maura. mary loved gardening, she loved reading and she loved the theater. she was a great neighbor, a really beautiful person who on that day did something that a lot of us hope we would do but we can't really be sure. about 9:30 that morning, adam lanza blasted his way through the locked doors of sandy hook elementary school. the principal of the school, dawn and mary were meeting, i believe. when they heard the bullets and the glass crash, they must have known something horrible happened. there are two instincts at that point. you freeze, you run the other way, or you do what dawn and mary did and you run to the bullets. that's what she did. her school was in trouble. something awful was happening. and mary and her principal ran to the gunfire and the gunman. they didn't run away. now, plenty of people in that school did heroic and courageous things that day, stowed kids in closets and classrooms, hugged kids as the bullets rained down. mary and dawn were the first people who died because