On the morning of Tuesday, January 15, 1991, Sandra Burt Carrera, a 41-year-old single mother and business manager at an architecture firm in Washington, D.C., was found fatally wounded by a single gunshot to the head in her Arlington, Virginia, town house in the 2500 block of South Walter Reed Drive. Her 11-year-old son discovered her body in the front doorway after returning home from school; her body had lain there for nearly nine hours. She had spoken to her younger sister by phone about an hour before the killing.

There was no sign of forced entry and nothing appeared stolen. Arlington police initially described the homicide as showing indications of being domestic-related. Carrera’s ex-husband was investigated but ultimately not considered a suspect. Friends and colleagues said she was vivacious, energetic, and a devoted mother who had no known enemies. The case went cold and remains unsolved.

Did anyone in Arlington around January 15, 1991, hear or see anything that might help explain what happened to Sandra?