A man is dead after a shooting early Friday morning in Canarsie and now police are working to find out who did it. It happened just before 2:00am at Rockaway Parkway and Avenue N. Police say a 42-year-old man was shot in the back. Officers found shell casings on Avenue N and followed a trail of blood to Rockaway Parkway, where the victim was found. He was rushed to Brookdale Hospital but didn’t survive. A woman who witnessed the shooting told called 911 from her car. More on this from News 12 Brooklyn…