Thousands of uniformed officers gathered to say goodbye on Friday to FDNY Lt. Brian Sullivan.

A funeral for Sullivan was held at Sacred Heart Church in Monroe, where FDNY members were part of the procession.

Sullivan, who was 54 years old, suffered a fatal heart attack Saturday at Orange Regional Medical Center after working a 24-hour shift. Officials say he complained of chest pain while working his final shift, which means his death is considered a line-of-duty fatality.

The lieutenant served the FDNY for 27 years and leaves behind a wife and two daughters.