Very sad news. Chris was one of my all-time favourite drivers. IMO, not only should he have won races in F1, he easily had the talent to be a WDC, even in the talent-rich era he drove in. Time after time he would be leading races only for the car to fail (cars were nowhere near as reliable then as they are now). He also had terrible timing, leaving the new-born McLaren team to go to Ferrari, just when the former's sports cars became unbeatable in the Can-Am series (1967). Denny Hulme joined McLaren as Amon's replacement, so all of the wins he got in both the Can-Am and F1 should (theoretically) have been Chris's.
He then left Ferrari in 1970, just when they came out with their boxer engine and became very hot indeed, with Ickx being the beneficiary. He went to the newly formed March team. Unfortunately, Tyerrell was also using the new firm's 701 and got priority treatment over the factory's own drivers. Stewart got the maker's only win that year. In 1971, Chris moved on to the Matra team which, again, was competitive but unreliable while the March 711 became a race winner. The trend that followed Chris throughout his career.
What I found most endearing about Amon was that, unlike today's drivers, no matter what went wrong, he never got angry or started whining. I remember one time when a reporter asked Chris why he went slower in the second qualifying session than he had in the first, he replied: " Ah. Well, they have done some improvements".
A very classy individual. He will be missed.