Mary Patricia ("Pat") Santos, 79, passed away peacefully on January 4, 2018 in her home in Niagara Falls, NY. Pat was born April 12, 1938 in Lowell, Mass., daughter of the late Mary C. LeRiche and stepfather Francis LeRiche. She was educated in Lowell, which is where she met Avila J. Santos, whom she married in 1959 and enjoyed 47 years together until his passing in 2006. Pat had a long career as a bookkeeper at MacLellan Oil company in Lowell and retired in 2009, after which she moved to New York. She was a devoted friend, wife, mother to sons Paul and David, and a loving "Nana" to grandchildren Jessy and his partner Kassi Caneal, Matthew and Emma, and great-granddaughter Kayleigh. She will be deeply missed by her sons Paul Santos and his wife Mardi Balgochian, and David Santos and his wife Tammy, their families, and numerous aunts, cousins and friends. Pat will be laid to rest with her husband in St. Patrick's Cemetery in Lowell on Friday, January 12, 2018.