When I sat down to talk with the sisters of Bonnie Bickwit and Mitchel Weiser, it was hard for me to imagine what it must have been like: The summer of '73, and suddenly, a sibling vanishes.

Mitch and Bonnie never came home from a rock concert they planned to attend that July. The 70s became the 80s and the 80s became the 90s and Mitch and Bonnie, good students from John Dewey High School in Brooklyn, were still gone.

Today, it is still considered an open missing persons case. But Sheryl Kagen, Bonnie's sister, credits former Attorney General Eliot Spitzer with closing the case -- for her. Spitzer asked the state police to re-canvas some of the people who'd watched an MSNBC special on the disappearance.

And one man, from Rhode Island, said that all those years ago, he remembers seeing Mitch and Bonnie drown -- when their ride home from that concert at Watkins Glen, veered into the Susquehanna River. Never mind that their bodies were never found. The fact this tragedy might have an accidental explanation, instead of a criminal one -- was comfort enough to a family that had wondered long enough.

Remembering Mitch and Bonnie