Last time, I was looking at Bananaman strips from the late 90s adapting episodes of the 80s TV series, which were drawn by John Geering -- who had created the strip and drawn the vast majority of it up to that point, but had no known involvement in the series. It would be worth going back and reading that piece if you haven't already, as that way this one will make sense.
But in short: the last strip adapting a TV episode is from the issue of the Dandy dated 3rd July 1999, and a week later a wholly original strip appeared for the Dandy's world-record-breaking 3007th issue, dated the 10th July. On the 20th July, John Geering died. (Some sources list his death as the 13th August, which is the date his obituary appeared in his local newspaper, the Warrington Guardian; I am presuming the date given in the Independent's obituary is correct.) However -- as was often the case when an artist passed away -- he had a buffer of strips built up, and new stories by him continued to regularly appear in the Beano and the Dandy for around two months after his death.
In issue #3004 (19/06/99), another strip drawn by Geering had started appearing in the Dandy: a revival of Puss and Boots, the very first characters he had created for D. C. Thomson in 1969.