Parents who lost children to gun violence gather at Chicago police headquarters to demand that Chicago police detectives solve their cases. Gregory Robinson’s family and loved ones hold a banner in memory of Gregory Robinson. In 2009 Gregory Robinson was in a car with several family members when someone fired a gun into the car. Gregory tried to protect the children in the car and was murdered. The 14-year-old was a basketball player at Simeon high school in Chicago. His case has not been solved by Chicago police.