Rotterdam – Joseph J. Demkowski, 45, passed away unexpectedly on Friday, October 8th, 2021. He is survived by his father, John W. Demkowski, brother, Paul Demkowski (Madeline) and nephew, Crew Demkowski. He was predeceased by his mother, Carolyn E. Demkowski. A graveside service will be held privately at the convenience of the family at St. Adalbert’s Cemetery in Rotterdam.