I was doing a deep dive on Wookieepedia to try and discover what I could about Siri Tachi's death, when I saw in the citations that it happened to be covered in a book I already owned.
Fate? Maybe so.
This is a compilation of two separate "companion" books by Jude Watson, with the thrown-in addition of her short story The Last One Standing as a sort of after-credits scene.
Legacy of the Jedi is four stories, following the lineage of Dooku, Qui-Gon, Obi-Wan, and then Anakin. Secrets of the Jedi is two stories, a longer one about Obi-Wan and Siri as padawans, and a shorter conclusion dealing with them as knights during the Clone Wars, and her aforementioned death. All throughout there are tie-ins and shoutouts to Watson's main JA and JQ series. (Tahl, Melida/Daan, Ferus Olin, the bounty hunters from Ragoon-6, etc.)
All of this is no longer canon, but I found it extremely valuable. Of course, I learned what I needed about Siri's death, but honestly the most interesting parts were with Dooku at the beginning. I still think it's intriguing that in Legends he had a master who was not Yoda, and yet was barely mentioned anywhere. The parts about him as a padawan gave up some valuable information about the Temple and life in it. There was also some insight into Anakin and Padme's relationship that I hadn't expected.
The Last One Standing, obviously, is one of the most painful pieces of Sad Hermit Obi-Wan media ever created.