A growth on the artery wall is 'choking off' the blood supply.
He was 'choking back tears' as he talked about his late wife.
She 'choked' to death. = She died by 'choking'.
(..) right down to King's Landing, they're laughing at us. I hear it in my sleep! I'm not dead yet, unfortunately for you. And I'll not leave this world until they all choke on that laughter. Take that castle back. He'll never yield, Father. Oh, he'll yield. You'll show him the knife you used (..)2016 TvShow: Game of Thrones Title: Blood of My Blood Season: 6 Episode 6