STONY BROOK - A fraternity at Stony Brook University organized a vigil tonight to remember the black Florida teen who was fatally shot by a neighbor last month. A sea of Stony Brook students wore hooded sweatshirts and carried Skittles, just as 17-year-old Trayvon Martin did on the night he was killed. Martin was shot by George Zimmerman, a neighborhood watch volunteer who claims he acted out of self-defense. Investigators say the teen had just picked up soda and Skittles at a 7-Eleven and was heading back home.Zimmerman has not been charged in the shooting that has sparked a nationwide debate on race issues.The vigil was organized by Alpha Phi Alpha, Stony Brook's first African-American fraternity.