THE BRONX - Investigators are still searching for the contractor who fell from the Throgs Neck Bridge this morning, but say the man is presumed dead. MTA officials say the 35-year-old worker slipped off a platform suspended under the bridge at around 8:15 a.m. The man's name has not been released, but News 12 Long Island has learned that he worked for Islandia-based Nuco Painting Corp. The MTA also says it requires all workers to wear harnesses while on any bridge. Officials say the search has now shifted into a recovery effort.