Not everyone knows who Chris was. He was the co-founder (with Jon Anderson) of Yes, the legendary Progrock band. At the announcement of his illness Chris sent regrets that he wouldn't be on this year's Summer tour, the first time in Yes' 47 years that he'd be absent. There is much online about Yes and Chris, anyone interested can find their entire histories. Youtube has all the Yes albums as well.
This feels like losing an old friend. With his death, and Jon Anderson not in the band anymore, to me it's the death of Yes as well. All things must pass, but that doesn't mean it doesn't hurt.
From Wiki, on his nickname: "Chris Squire was commonly known by his nickname, "Fish", and the name is associated with many of his works including his solo record, Fish Out of Water, and the solo piece "The Fish (Schindleria Praematurus)" from the 1971 Yes record Fragile. The name has multiple origins, not least of which is the heteronymic meanings of "bass", describing low frequency sound or the bass guitar as well as the fish. Additionally, Squire's astrological sign was Pisces. Further, in the early days of Yes' career, he once accidentally flooded a hotel room in Oslo, Norway, while taking a shower, and Bill Bruford gave him the nickname. On the 2007 documentary "The Classic Artists Series 3: Yes", Bruford says that the nickname arose because Squire spent long periods in the bathroom while they shared a house together in Fulham."
He was a close friend of Greg Lake's for almost 50 years, going back to their being roommates in London when they both were starting out and finding their first successes.
Chris played bass like nobody else could. He wrote songs we'll have forever. I'll treasure that moment when he smiled wildly and gave me a protest fist as the cops carried me off in Madison Square Garden all my days.
Farewell. RIP. Thanks.