Oneida, N.Y. - There is a $40,000 dollar reward now for information regarding Tammy Mahoney.
The FBI along with the Oneida Nation upped the reward, in hopes someone will come forward with information.
FBI Special Agent James Hendrix said recent events have led them to believe someone is out there who may know what happened.
Mahoney was last seen alive May 1981, on Route 46 near the Oneida Indian Nation.
She was 19 at the time.
Investigators believe she was murdered, but her body hasn't been found.