Ok so, to be super clear: as said on his bio in the cast page, Gareth spent some time volunteering, right after he graduated. Initially he was supposed to stay [...]
It's a flashback!!!
But, even though this is a memory, Gareth is alright and he did survided the events of the season 6 finale, so you don't have to worry [...]
And we kick off sason 7!
And YES, of course Gareth is alive! I'm not killing him off, so yes, he's alive and breathing. Confirmed by the creator.
Anyway, [...]