Great-great grandparents separated?

What happened with my Great-Great grandparents, John Alexander Schell and Mary Jane Ross? Many years ago I found John A Schell listed in the 1911 Canadian census living with one of their daughters in Muskoka. He died a few months after the census (confirmed with death certificate). Since John was listed as a widower, and family trees uploaded on WorldConnect gave death dates for Mary Jane as around 1902 or 1905, I accepted that she had died sometime between the 1901 and 1911 censuses. The couple were together in New Lowell at the time of the 1901 census. I have yet to locate burial location for either one of them. Were they buried together, or separate in the vicinity of the locale of their death? I have visited the Angus Cemetery numerous times (many of my branches have been buried there) over the years and they are not buried there. I haven't made the time to visit the New Lowell or Glencairn cemeteries (where other branches are located), but have purchased the Cemetery books published by the Simcoe Branch of the OGS for those two cemeteries. I have also searched a similar book for the Stayner cemetery at the library for the Saskatchewan Genealogical Society. Besides the mystery of their burial location, where was Mary Jane (nee Ross) Schell at the time of the 1911 census. I will need to recheck my records, but I believe I have previously accounted for all of their children in that census and Mary Jane is not listed with them. If Mary Jane was still living, but the couple living apart, in 1911, why was John A listed as widowed? I know quite often, a divorced person was listed as widowed to avoid public shame. However, I also know that information recorded in a census is not always accurate for a variety of reasons.