Were the Twelve Imams from the lineage of Imam Ali (may Allah be pleased with him) killed by poison or in battles, and did they die unjustly? What is the wisdom behind their killing, and who truly killed them? And why do the Sunnis not learn about their biographies?

Ali and Al-Hussein were martyred. As for Al-Hasan, it was said that he was killed by poisoning, but this has not been proven by legitimate evidence. Ali ibn Al-Hussein, Muhammad ibn Ali, Ja’far ibn Muhammad, Musa Al-Kadhim, Ali Al-Hadi, and Hasan Al-Askari died natural deaths. It was also said that Ali Al-Ridha died by poisoning. As for Muhammad Al-Jawad, he died in Baghdad, while no descendants are mentioned for Muhammad ibn Hasan Al-Askari.