They met in high school and became lifelong friends. For six years.
Carol Kestenbaum, from Bellmore, L.I., and Nicole Schiffman, from Merrick, L.I., — classmates at Kennedy High School in Merrick — were typical teenage friends, “talking together and shopping together and watching movies together,” said Laurie Fontana, a friend of the Kestenbaum family. They graduated together in 2005. “They went together to their senior prom.”