Rotterdam - Dennis J. Gavigan, age 70, of Rotterdam, NY passed away on Thursday, February 18th, 2021. Survivors include his wife, Gelsomina; three sons, John, Mark and Peter; two grandchildren, Giovanna and Devin, whom he adored; his brother, Barry, and several nieces and nephews. Dennis was employed as a tool maker at the General Electric Company for 40 years. A mass will be celebrated on Thursday, February 25th at 9:30am at Our Lady Queen of Peace Church, 210 Princetown Road in Rotterdam. Family and friends are invited to attend. Memorial donations in Dennis' name may be made to the American Cancer Society, PO Box 22478, Oklahoma City, OK 73123.