Reynolds, who lived out his last years in Croydon, south London, had been in poor health in the last few months.
His son Nick Reynolds confirmed that he passed away in his sleep.
More top news
Elena Veronica Ciochina left her home in Newham on Saturday night and hasn't been seen since.
The internet's favourite grumpy feline has flown over from the US to take in the sights of London but looks less than impressed.
Nero jumped a fence in Watford which had a 12-foot drop the other side.