>> rivera, mother of a young daughter, is just 25 years old. >> just the enormity of this huge sense of waste. this child lost her mother. >> another murder. again, a single shot, two people in a box type truck with a damaged tailgate. >> so far, they haven't found anybody and that's the situation as we know it right now out here. >> it's quiet for the next 12 hours. then, just a few blocks from the montgomery county line, one more shot shatters the night. 72-year-old pasqual charlotte, a retired carpenter, dies at the scene. >> in montgomery county, we average 20 homicides in a year and we've had five of them in the space of a 16-hour period. >> if you look at the victims