Very sad news and yes - as mentioned above - the end of an era. Pete King - as well as being the 'business half' of the Scott/King management of the Club in its prime, was a very good sax player who played in the larger Ronnie Scott 50s groups, including the short-lived orchestra that he fronted. He can be heard on some of those old Esquire recordings with Scott.
He sold me a club membership on one occasion back in the early 80s, directly from his back office. A small, wiry and no-nonsense Londoner with a boxer's build and great dedication to the club (he could be seen most nights in those days sorting out various issues, welcoming folks in etc). I'm sorry to hear about the problems with Alzheimers after he sold the club to Sally Greene; that is very sad. For sure, the UK jazz scene owes this dedicated man a great deal - RIP