The First 48: The Detective Speaks

In New Orleans, a young mother is ambushed at home and shot at close range. Detective Rob Barrere's case depends solely on the eyewitness account of a four-year-old girl and leads to another brutal death.

Detective Summer Benton uncovers the shocking reason why a young Atlanta father was ambushed and murdered by gunmen.

In Memphis, Lt. Toney Armstrong and his team respond to Memphis's worst mass murder in more than 15 years, where they find four adults and two children dead -- a possible gang-ordered directive.