Menachem Mendel is reporting Rabbi Louis Jacobs passed away over Shabbat. Baruch Dayan HaEmet.
UPDATE: Paul Shaviv notes in the comments below and on AJHistory that Rabbi Louis Jacobs was the expert witness retained by Chabad during its fight with the family of the 6th rebbe to prove gifts given to a hasidic rebbe become the property of the hasidic movement and not of the rebbe himself.
It so happens that Rabbi Jacobs was wrong – hasidic history, including Chabad hasidic history, is full of examples where gifts to a rebbe became the private property of that rebbe. Furthermore, the 6th rebbe had privately purchased most of his library, and most of those purchases were of secular books, including titles like Sherlock Holmes in Yiddish.
That aside, Baruch Dayan HaEmet.