According to open source information, David Williams, then age 12, and Steven Anderson, then age 17, were reported missing from the New Lisbon State School on 04/07/1975.

The New Lisbon State School, now known as the New Lisbon Developmental Center is located in Burlington County, New Jersey. Both Williams and Anderson lived on the 1,896-acre center located off Route 72 in the New Jersey Pinelands. Both Williams and Anderson had been diagnosed with developmental disabilities and were unable to care for themselves without supervision. 

The boys, who were roommates, were last seen at approximately 4:15 p.m., walking towards their residence from a nearby ball field where they had been playing with staff members.