Liz Marley (User:LizMarley) contributed to Wikidata - mostly using Mix'n'Match - as part of her work as editor of the United Kingdom Parliament’s Thesaurus ([1]). She made over 1,000 edits, but her contribution went beyond that, and she regularly and generously answered other Wikidata editors' questions about the thesaurus on Twitter, and in private correspondence. At only 53, her death was sudden and unexpected ([2]). She will be missed by her friends on Wikidata, in the Parliamentary library, and elsewhere. Her workplace has posted this tribute.
