I am aggrieved to bring sad news: Today my old friend Johanna Narten has passed away. 

Among Indologists, Iranists and Indo-Europeanists, she is well remembered for her work on the Indo-European and Skt. verbal system, for example the s-Aorist; on Zoroaster’s Yasna Haptanhaiti, and the Amesha Spentas in the Avesta.

More news to follow.
Michael Witzel 

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See for example: 
Johanna Narten: Die sigmatischen Aoriste im Veda, [v], 311 pp
www.worldcat.org/title/anusantatyai-festschrift
www.amazon.com/Yasna-Haptanhaiti-German-Johanna..
Johanna Narten: Die Am∂ša Sp∂ṇtas im Avesta. xii, 155 ...
Johanna Narten. Kleine Schriften - Walmart.com