well- on the 1901 canadian index, there is there is an Anne Roberts and an Annie Roberts, both fitting the age that Abel's wife would be. There is always the possibility that he passed away.
Here is a link to a map of St John's in 1862. Our boundaries for the wards dont; change until the names do ( they chnage to wards 1, 2, 3 etc in about 1890's....)
http://www.ontarioroots.com/images/maps/1862/1862_st_john.jpgI am heading away for a week - but I will gladly do some lookups here for you when I get back. It is doubtful there are too many Abel Roberts in Toronto - and we have death indexes available at the archives until 1932. I can also look up - or if someone else here does before I get back - Elizabeth's death certificate. That will give her status of marriage at death (whether a widow), and may give burial place....
Certificates in Ontario are held at the archiives on film up to a certain point. They are at 1908 for births, 1924 for marriages and 1932 for deaths, each year this goes up by 1. HOWEVER - there is no access to any indexes after these times either. This is just for Ontario. We do not have a federal (national) registrar per se. BMD's are the responsibility of each province.
If you go to
www.tpl.toronto.comand click on the search magazines, newspapers, etc
enter as a guest, and open the genealogy folder, and search the digital collection. They hold city directories up to 1881 digitally for Toronto - and these can be accessed from any computer!!! Your Robert J Roberts in the 1881 directory is on page 390, and is a bookkeeper living at 48 Terauly. You'll find that on your map of St John ward. That is now a part of Bay Street - and would be part of the location of our New City Hall ( built in 1867). That really wasn't that bad a part of town in 1881 :-)
Anyways - any help that I can be to you - or anyone needing help or advice about Toronto, that would be why I chose the nickname "TommyToronto" :-)
Tom
P.S. - There is a "pages of the past" paid service to view old Toronto Star's online - however - they did not start publishing until 1894, and I find the obituary section to be fairly scarce, until the mid 1910-1920's.