was he killed by any assassins during his final years?
Yes, on 13 December 1121, during a procession on the last day of Ramadan.
Al-Afdal Shahanshah
On 13 December 1121, during a procession on the last day of Ramadan, al-Afdal was assassinated. 
the last of the crusades end in the city of constantinople in 1099 False. when did the first crusade begin? 1096. what was this crusade about? It was the first of a series of religious wars initiated, supported, and sometimes directed by the Latin Church in the medieval period. what were the objectives of this war? The recovery of the Holy Land from Islamic rule. what can you tell about "princes' crusade"? Some historians put a figure of 70,000 to 80,000 on the number who left Western Europe, the number of Knights range from 7,000 to 10,000; 35,000 to 50,000 foot soldiers; and including non-combatants a total of 60,000 to 100,000. when did the battle of ascalon happen? 9 August. any individuals who were involved in this battle?? Al-Afdal Shahanshah, Geoffrey and Raymond, to name a few. who's the first one? He was a vizier of the Fatimid caliphs of Egypt. where was he born? Acre. where is this  place located? UNANSWERABLE
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Al-Afdal Shahanshah [SEP] Final years and assassination
In 1115, an assassin tried to kill al-Afdal, but he was saved by his bodyguards. While he was not harmed, his health deteriorated from that time, leading to assigning his brother Ja'far the task of adding the official, calligraphic signature to documents, while in 1115, he designated his son, Sama al-Mulk, as his deputy (and thus heir-apparent). Following another failed attack by three assassins in 1118, al-Afdal suspected his own sons, and had them deprived of their positions and incomes. On 13 December 1121, during a procession on the last day of Ramadan, al-Afdal was assassinated. The deed was commonly attributed to (and claimed by) the Nizari Order of Assassins.