The family of a young woman gunned down at a Manhattan Burger King demanded justice Saturday as they thanked supporters at a makeshift memorial. Kristal Bayron-Nieves, 19, was killed during a robbery while working the night shift last week. Her mother, Kristie Nieves, 36, clutched a big teddy bear handed to her by a supporter. She came to the crime scene, walking distance from the family’s home, with a sister, brother-in-law and cousins. She began speaking to reporters and well-wishers but did not get far. “Thank you everyone and everyone who supported me including my family” she said, growing increasingly...