Thread:Master Sima Yi/@comment-94.0.109.235-20111021123439/@comment-1153722-20111021124433

http://assassinscreed.wikia.com/wiki/Chapter_1_-_Fiora_Cavazza#Moving_Target

Read that section. It confirms Baltasar to have died, but not whether the Assassins or Fiora dealt the finishing blow. I presume he died of his wounds.