you question is offtopic and correct answer from authentic history these all killed by sabaties (followers of abdullah bin sabah they jew).
Cut the crap, this is not your Nasibi madrassa where you will say and we will accept without using our Aql. The truth is that known Sahaba were invovled in the murder of Uthman** and its an open challenge** to any Nasibi to prove the role of Abdullah Ibn Saba in the murder of Uthman via authentic sources.