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Rex Heuermann expected to plead guilty in Gilgo Beach serial killings. Here's what you need to know.

Thursday marks 15 years since what the FDNY remembers as Black Sunday.
On Jan. 23, 2005, there were two fires--one in the Bronx and one in Brooklyn. Those fires killed four firefighters: Lieutenants Curtis Meyran, John Bellew and Joseph Dibernardo and firefighter Richard Sclafani.
The FDNY remembered their sacrifices on Thursday.