Retired firefighter Dennis A. Farrell died Tuesday after battling a 9/11-related illness, the New York City Fire Department announced on Friday. "We lost another FDNY brother to 9/11 illness," the Ray Pfeifer Foundation, a nonprofit helping firefighters and police officers who responded to the Sept. 11, 2001, attacks on the World Trade Center with medical needs not covered by insurance, said in a Facebook post. "Our thoughts are with the family and friends of Dennis A.