From Coffeetown Press:
It's with great sadness that we announce that Hazel Holt, author of the Mrs. Malory Mysteries, died on November 23, 2015. Hazel was a lovely person and an absolute pleasure to work with. Coffeetown has reprinted the first 7 Mrs. Malory novels, along with an original mystery, My Dear Charlotte.
Coffeetown also reprinted several books by Barbara Pym. Hazel was her biographer and wrote forewords for these books, which she originally had published after Barbara died.

She is survived by her son, Tom Holt, author of Lucia in Wartime and Lucia Triumphant (reprinted by Coffeetown).