Naruto issues 604 and 605 show that Kakashi killed his teammate Rin, giving both himself an Obito a Mangekyo Sharingan. The circumstances behind it are unknown. He has given contradicting information about it, which could be a lie or perhaps he was being controlled at the time and does not remember.
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The sheer exhaustion from the overuse of Mangekyou / amaterasu / That giant skully thing combined with the lack of chakra and fighting Sasuke and transferring all of his abilities and skills into Sasuke's mind meant that his body could no longer remain alive, so he died.
In order to obtain the Mangekyou Sharingan, Itachi killed his best friend Shisui Uchiha who is like a brother to him.
Copy Ninja Kakashi and Kakashi of the Sharingan
yes......
No, Sasuke has now obtained the Eternal Mangekyo Sharingan, by transplanting his dead brother Itachi's eyes. One ability of the Eternal form is that the user will never suffer blindness from overuse.
Kishimoto said Kakashi Chronicles would start from the beginning were Kakashi was an Academy Student to Kakashi having the Sharingan.
no he didnt, his friend was killed by a ninja (this is manga im talking about) and his friend gave him his sharingan eye (one eye was covered by the giant boulder that crushed half his body) for a birthday present. --- not birthday present but a gift for Kakashi becoming a Chunin and although Kakashi have mangekyo sharingan which you can only get if you kill someone close to you like a best friend or brother. it still unkown how Kakashi can use mangekyo sharingan.