In 2008, Dubay was diagnosed as having early stages of
bladder cancer. He began
chemotherapy and
radiotherapy, which after several months successfully induced
remission. He was forced, however, to cancel all of his travel engagements, some of which had planned for several years. He chose to remain with the Marist community in Washington, D.C., and began to serve local parishes and high schools with spiritual direction, counseling, and lecturing. In 2009 he was moved to a nearby nursing center run by the
Little Sisters of the Poor in Washington, DC. In early September 2010, in order to receive onsite
dialysis, he was moved to a nursing care center in
Silver Spring, Maryland. He was taken to
Holy Cross Hospital on September 25, and died the following day. He was buried on October 7 in Washington, DC. A Facebook group advocating that a cause for canonization be initiated was formed June 20, 2022. == Personal life ==