Gerald A. Hadden, 29, of Susquehanna, Pa., was at a work site at 1890 Dryden Road when the accident occurred, said New York state police. The beam was supported by a crane when it dislodged and struck Hadden in the head.
He was transported to Cayuga Medical Center at Ithaca, where he was pronounced dead at 11:37 a.m.
Police said the company performing the work was Benedict Antique Lumber and Stone based in New Milford, Pa.
The U.S. Occupational Safety and Health Administration is investigating the incident.