Officer Rank: Detective
Department: New York City, New York, P.D.
End of Watch: 07/14/2020
Cause: 9/11-related incident
Length of Service: 29 years
Detective Brennan performed duties related to the rescue and recovery work after the terrorist attack at the World Trade Center on September 11, 2001. Detective Brennan died due to metastatic lung cancer on July 14, 2020. The diagnosed illness is on the NIOSH/WTC Health Program list of covered conditions. The December 2009, date of diagnosis is within the established minimum latency period of 4 years established by NIOSH for lung cancer.