How did the Infaillible (as) die?

After receiving many request to write an article about how our Imam were killed (since none of them has died naturally) I decided to write one with the words of Sheikh al-Saduq.

Note the scholars differ on the death of the Prophet (some say that he died because of Aisha and Hafsa as 'Allamah al-Majlissi in Hayat al-Qulub)

And our belief in the Prophet (sawa) that he was poisoned in the Battle of Khaybar (in other copy at Hunayn), and that poison was inside him until it destroy his Aorta (A vain in the back and it was said in the heart if it interrupted he die), then he died because of it.
واعتقادنا في النبي صلى الله عليه وآله وسلم أنه سم في غزوة خيبر (4)، فما زالت هذه الأكلة تعاده حتى قطعت أبهره (5) فمات منها.

And Amir al-Muminin - (peace be upon him) - 'Abdul-Rahman Ibn Muljim (may Allah curse him) killed him
وأمير المؤمنين - عليه السلام - قتله عبد الرحمن بن ملجم لعنه الله، ودفن بالغري.

And al-Hassan Ibn 'Ali - (peace be upon them) - his wife Ju'dah Bint al-Ash'ab al-Kundi poisoned him and he died because of that.
والحسن بن علي - عليهما السلام - سمته امرأته جعدة بنت الأشعث الكندي، مات في ذلك.

And al-Hussein Ibn 'Ali - (peace be upon them) - Killed in Karbala, and his killer is Sinan Ibn Anas (may Allah curse him).
والحسين بن علي - عليهما السلام - قتل بكربلاء، وقاتله سنان بن أنس لعنه الله (1).

And 'Ali Ibn al-Hussein the Master of  worshippers - (peace be upon them) al-Walid Ibn Abdel-Malik poisoned him and (that what) killed him.
وعلي بن الحسين سيد العابدين - عليه السلام - سمه الوليد بن عبد الملك فقتله.

And al-Baqir Muhammad Ibn 'Ali - (peace be upon them) - Ibrahim Ibn al-Walid poisoned him and (that what) killed him.
والباقر محمد بن علي - عليهما السلام - سمه إبراهيم بن وليد فقتله.

And al-Sadiq - (peace be upon him) - al-Mansur poisoned him and (that what) killed him.
والصادق - عليه السلام - سمه المنصور فقتله (2).

And Musa Ibn Ja'far - (peace be upon them) - Harun al-Rashid poisoned him and (that what) killed him.
وموسى بن جعفر - عليهما السلام - سمه هارون الرشيد فقتله.

And al-Redha 'Ali Ibn Musa - (peace be upon them) - al-Mamun killed him with poison.
والرضا علي بن موسى - عليهما السلام - قتله المأمون بالسم.

And Abu Ja'far Muhammad Ibn 'Ali - (peace be upon them) -al-Mu'tasim killed him with poison.
وأبو جعفر محمد بن علي - عليهما السلام - قتله المعتصم بالسم.

And 'Ali Ibn Muhammad - (peace be upon him) - al-Mu'tamid killed him with poison.
وعلي بن محمد - عليه السلام - قتله المعتضد (3) بالسم.

And al-Hassan Ibn 'Ali al-'Askari - (peace be upon him) - al-Mu'tadid (in other copy al-Mutawakil) killed him with poison.
والحسن بن علي العسكري - عليه السلام - قتله المعتمد (١) بالسم.

It was reported that the Prophet (saw) and Imam - (peace be upon them) - are killed, and the one who says they are not killed, has lied about them, and whoever lie on them has lied on Allah, and he will have been a disbeliever and will be out of Islam. [And whoever desires other than Islam as religion - never will it be accepted from him, and he, in the Hereafter, will be among the losers.]
وقد أخبر النبي صلى الله عليه وآله وسلم والأئمة - عليهم السلام - أنهم مقتولون، فمن قال إنهم لم يقتلوا فقد كذبهم، ومن كذبهم كذب الله وكفر به وخرج من الاسلام، ﴿ومن يبتغ غير الاسلام دينا فلن يقبل منه وهو في الآخرة من الخاسرين﴾ (3).
- al-I'tiqadat fi Din al-Imamiyah of Sheikh al-Saduq, Page 97 to 99