Family, friends and supporters gathered on the second anniversary of the death of Bronx teenager Ramarley Graham.
Graham's family was joined by the parents of Sean Bell, Anthony Rosario and Kimani Gray, who were all killed in police shootings.
They described Graham as a boy who always stood up for his friends.
Speaking to the crowd, his mother asked if the police officer who killed her son was consumed by guilt.
"He looked at my son's eyes and used his heart for target practice. He shot my son point plank in his chest. I wonder, how does he sleep at night knowing he killed an innocent person?" said Constance Malcolm, Graham's mother.
In 2012, Graham was shot and killed in his home by NYPD Officer Richard Haste.
A Bronx grand jury indicted Haste on two counts of manslaughter but in May, a judge threw out the case on a technicality.
The U.S. Justice Department is now reviewing the case.