Could DNA from a smoothie straw help solve the cold case killing of NY teen?

More than 40 years ago, in the suburbs of Long Island, New York, Theresa Fusco, 16, vanished.

Her body was found a month later.

For investigators, finding out what really happened would take decades.

And now, as "48 Hours" correspondent Erin Moriarty reports, the case rests on DNA from a smoothie straw.