On a February morning in 2007, 38-year-old Ira Irvin was shot once in the chest inside his living room on Suffolk Street in the North Side of Pittsburgh. The shooting occurred at about 10 a.m.; Irvin’s girlfriend and two young children were in the house when someone knocked at the door and the fatal shot was fired. The girlfriend, barefoot and distraught, ran from the home and made the 911 call saying her boyfriend had been shot after answering the door.

Neighbors were drawn by her cries and police later took the girlfriend to headquarters for questioning while the children, unharmed, were collected by a woman who identified herself as their mother. No public report of an arrest has been made, and the identity of the person who knocked and fired remains unknown.

Does anyone have information about who might have been at that door that morning?