Two FDNY firefighters who were sickened by their work at Ground Zero after the 9/11 terror attacks died on the same day last week, fire officials said.

Firefighter Richard Jones, 63, and Lt Paul Deo Jr., 74, both died of unspecified illnesses on Friday, FDNY Commissioner Daniel Nigro said in a statement.

Jones served in the department for two decades, serving in Ladder 25 on the Upper West Side, the FDNY said. He received three acts of merit during his career in 1992 and 1997.

Deo retired out of Engine 317 in St. Albans after serving in the department for 33 years.

Both of the smoke eaters retired about a year after the 2001 terror attack that brought down the Twin Towers in Lower Manhattan and killed more than 300 firefighters at Ground Zero.

“Nearly two decades later, our FDNY family continues to lose remarkable men and women who never wavered in their commitment to protecting life and property in our city. Our department will never forget them or the bravery they exuded throughout their careers,” Commissioner Nigro said in a statement Sunday.