McWilliams, Dennis J. on December 2, 2016 of Wading River, NY. Beloved husband of Ellen M. McWilliams. Loving father of Shawn Mayers (Ellisha), Dennis J. McWilliams II (Kelly), and Courtney Q. McWilliams. Cherished grandfather of Molly, Seamus, Teagan and Brianna. Reposing at O.B. Davis Funeral Homes, 1001 Route 25A, Miller Place, New York. Visitation Thursday, December 8, 2016 from 2-4 and 7-9 pm. Funeral Mass Friday, December 9, 2016, 10 am St. John the Baptist R.C. Church, Wading River, New York. Interment to follow at Calverton National Cemetery.