Daniel Knab, 28, was shot in the back in the early morning hours of a Friday in February 2012 on the 3500 block of Arthur Street in the Holmesburg neighborhood of Philadelphia. The shooting occurred at about 4:57 a.m.; emergency responders pronounced him dead at 5:04 a.m. He lived in the Mayfair section of the city.

The shooting was reported amid a violent weekend that included multiple homicides. In the immediate aftermath police opened a homicide investigation but did not release a motive, and no suspects or arrests had been identified in the days after the killing.

Did anyone in Holmesburg or Mayfair remember seeing or hearing anything that night, or have information that could help clarify what happened to Daniel Knab?