Family, friends and fellow firefighters said their final goodbyes Thursday morning to retired Supervising FDNY Fire Marshal John McCauley.

McCauley was one of four FDNY firefighters who died from 9/11-related illnesses in the past week.

"Twenty-one years since the attack, we're still losing people. This is approximately the 287th person who has died since Sept. 11, losing 343 firefighters on that day," said FDNY Lt. James McCarthy.

Retired firefighter Robert Reynolds, who was assigned to Engine 96, died on May 28. He served with the FDNY for 20 years.

Retired firefighter Michael Verzi, of Engine 97, died the following day.

A fourth FDNY firefighter, Deputy Chief Vincent Mandala of Division 11, also died.

The four New York City firefighters died nearly 20 years to the day after the conclusion of the cleanup efforts at ground zero.

Exposure to toxic dust and fumes at ground zero and in the monthslong recovery that followed resulted in cancers and other illnesses among firefighters.

"The Zadroga bill that covers medical monitoring and prescription drugs covers you 25 years after the fact, so it's going to end in five years, so we have to go back to Congress to get that refunded," McCarthy said.

Funerals for the other three firefighters will be held in the coming days.