
Edgar was living in a home for disabled individuals and had recently attempted suicide. When he disappeared his family thought he had either killed himself or been murdered.
Apparently Edgar suffered some kind of trauma to his head and lost his memory until recently.
Apparently DNA tests confirmed his identity.
It's an odd story because I can't help but wonder how he survived for those 30 years if it is true, as the article states, he functions at the level of a 12 year old.

Source:
I hoped to find news stories of the disappearance in 1986 but had no luck.
Continue reading at Canada man missing for 30 years found after remembering identity
Image credit: Screenshot from http://www.bbc.com/news/world-us-canada-35557275