Yaghan is one of the tiniest languages as far as the amount of speakers goes, and its sole speaker died just now, essentially the language died with her. She said previously there are others who know it some but none use it as well as she. We can just accept her word that she was fully master of it. When does a language die? While some people understood her, wouldn't a language alive when an intelligible conversation can be done with it, where both sides are active speaker, and one of them isn't just a mere listener?
Yaghans are/were natives in the regions of the southernmost Chile and Argentina. They were hunger-gatherers in the past, now they do what South Americans do I guess.
https://www.omniglot.com/writing/yaghan.htm
https://www.boisestatepublicradio.org/2022-02-18/cristina-calderon-chiles-last-known-yaghan-speaker-dies-at-93