Cohoes – William (Bill)J. McMahon, 55, of Cohoes passed away at Samaritan Hospital, Troy on Wednesday, April 24, 2019. Born and educated in Cohoes, he was the son of the late Robert and Mary Robitaille McMahon. He was a roofer at Zennaiter Construction Company in Mechanicville for many years. Bill is survived by his children, William, Katelyn, Daniel and Felicia and 9 grandchildren. Brother of Linda Hahn and the late Robert McMahon. A Celebration of Life will be held on Monday, April 29, 2019 at 6:00pm. The family will receive friends at the DUFRESNE FUNERAL HOME, Inc., 216 Columbia Street, Cohoes on Monday from 4 to 6pm prior to service. Inurnment will be held at the convenience of the family.