CS Lewis reported that JRR Tolkien, his close friend and brother Christian, visited him in spirit immediately after dying to reassure Lewis that dying was not scary.
That is intriguing.
Do you have any references or URLs?
Tolkien died in 1973 while CS Lewis died in 1963, so I am not sure what you are thinking of.
I did find this:
http://home.apu.edu/~CTRF/articles/2001_articles/wiebe.html
For example, Sir Alister Hardy reported (1975: 220) that C. S. Lewis appeared twice after his death to J. B. Phillips, well known translator of the New Testament.