Maybe cause he want to take the mankeyou sharingan or because was a zetsu clone but i think that is the 1st one.... OR
she was a spy for the hidden mist
in manga when kakashi killed rin the anbu guy said he's on to us(that means kakashi must have found out ) and the other guy said they worked so much to get it (he said much not hard so it means that the worked so much to train rin) the reason why kakashi was crying was because he broke his promise to obito.
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Rin was on Kakashi, Obito and Minato's team, she was their medic nin and was the one who transplanted Obito's remaining eye into Kakashi. For more info read this: http://naruto.wikia.com/wiki/Rin
Rin is one of the member of Team Minato , together with Kakashi and Obito. she's kidnapped? she died when Orochimaru attack Konoha.
When he was in a team it was Kakashi, Obuto and Rin was the girl. If your talking about the Team 7 when Kakashi is the sensei it's Naruto ,Sasuke and the girl is Sakura.
Yes. In the Kakashi Gaiden Arc, Kakkō used Earth Release: Rock Lodging Destruction to try and kill Kakashi Hatake, Obito Uchiha, and Rin. Obito pushed Kakashi out of the way of a falling rock, and Obito's right side was crushed. As Obito did not give Kakashi a gift when Kakashi was promoted to Jōnin, Obito decided to give Kakashi his remaining Sharingan eye. Rin obeyed Obito's wishes, and transfered his Sharingan eye into Kakashi's injured eye. While the cave falls, Obito thinks about his teamates and how he never got a chance to tell Rin he loved her. Kakashi avenges Obito by killing Kakkō with a perfected Chidori.
Yes. It was first shown that Kakashi was the one who killed Rin, piercing her chest with his Raikiri move. It was later revealed that she had thrown herself in front of him, the reason being she had been implanted with the Three-Tails, with the intention that it would attack the hidden village when she returned. She had asked Kakashi to kill her to prevent this, and when he refused, she took the matter into her own hands.