Yagura Karatachi

Little is known about this Jinchūriki yet. He hailed from Kirigakure and was the host of the Three-Tailed Giant Turtle. However, when Deidara and Tobi fought the Three-Tails, Deidara claimed the beast was weak because it had no host. This might possibly be because this Jinchūriki died.

Speculation
It is suggested that he is a relative of Suigetsu Hozuki and Yūkimaru, as they all have similar appearances. Also, it's been said that Yūkimaru can control the Three-Tails. It's also likely that he may appear in the current Three-Tails Arrival filler arc. It was also speculated that, judging from the sword on his back, that the Jinchūriki is Mangetsu Hozuki, and that he died when the beast was extracted.