I heard that on "social media" yesterday, but couldn't find any "official" news 'til this morning. 
A shame, he always seemed such a nice chap.
A top class motorcycle racer and a top class engineer, he will be greatly missed.
R.I.P. Peter Williams

https://www.bikesportnews.com/news/news-...s-had-died

P.S. It reminds me, in the 70s there was a documentary on TV about Peter Williams & the Norton, it even included his crash, if i remember correctly. It had a big impression on me, must see if I can find it somewhere!  (does anyone else remember it?)