I didn't know that Jamie McCrimmon had been killed off! I don't read any DW comic strips, with the exception of the hardback graphic novel "Star Trek: The Next Generation: Doctor Who Assimilation2", which I've got.

So does that mean Frazer Hines can not appear in Doctor Who again, if the comic strip is canon?

IMO, I would say not, as it wasn't a TV story. And not everyone who watches the TV stories every week, reads the story books and the comic strips.

Has anyone ever seen this on YouTube? https://www.youtube.com/watch?v=XWU6XL9xI4k

It's the scene that was never filmed, about how Rory's Father gets a letter from Amy and Rory's son Anthony. It has been recreated from Chris Chibnall's drawings of the mini episode.

I felt quite tearful after watching this.

It still feels as though it was yesterday that both Amy and Rory were there, travelling with the Doctor. Yet it's been over two years now, since they were unexpectedly taken back in time, never to be seen again.