Some provinces provide online access to inquests and coroners' reports (e.g. Manitoba), while in other jurisdictions you will need to contact the coroner's office directly to request a specific item. Check a search engine like Google to see what is available online.
A few inquests can be found in the Library's reserve collection - use the Library's Omni search feature to look for 'coroner or inquest' (scroll down to find the relevant entries).
Tip: try searching Canadian newspapers for articles mentioning inquests in your topic area. Once you have the names of the parties involved, the province, etc, try searching for them using Google or your favourite search engine.