That's too bad that the surviving children can't tell you the cause of death.
Hopefully, Lilybell will have some success with her library request.
Did you get his death certificate? Is the year of death (1932) stated on the Manitoba Vital Events website correct? In his son Ted's obit, it states that Ted was born in 1927 and was 15 when his dad died so that would make Edward's year of death 1942 and his age would be closer to what Lilybell found in the burial records. But in Annie's obit, it states that Edward died in 1932...the same as the Vital Stats site. Hmm....something doesn't add up!!
Have you thought about contacting the church to see if they have any records of his service as a lay preacher? Given his involvement with the church, they may have more information.
St. Mary's La Prairie Anglican Church, 36-2nd Street SW, Portage la Prairie, Manitoba, R1N 2A1
Good luck. I hope you eventually find the information you're seeking. I know how maddening it is to have pieces of the puzzle missing.
Susan