The Encyclopaedia Judaica records only that Bahya ibn Paquda was active as a rabbinic judge in Zaragoza in the second half of the eleventh century. His one surviving work carries no colophon date, and no later medieval chronicle independent of it fixes a death year, the same gap already recorded under his lifespan-start-year.
What would resolve this A dated document from Muslim Iberia or a later medieval Jewish chronicle naming Bahya ibn Paquda's death, distinct from the undated internal evidence of his one surviving work.
OpenHistory of medieval Iberian Jewry, history of Jewish ethical literatureMichael Berenbaum and Fred Skolnik (eds.), Encyclopaedia Judaica, 2nd edition