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Feedback was never a member of Alpha Flight (same for Flinch), feedback was said to be deceased after his appearance in X-Men as a member of X-Corporation, but he was later "revealed" to be alive. ...

So I guess they've all bit the big one at some point (a few more than once).

Dana

Ah...I didn't remember that story.

Stitch? Unless she's currently deceased (...And if she even counts as a member of Alpha Flight)?

Volume 2 and 3 Alphans? Murmur, Flex and Yukon Jack?
...

Madison?

Dana