Shisui Uchiha

was feared as and was one of the most talented of the Uchiha clan. Shisui was the best friend of Itachi Uchiha; in fact, Itachi thought of him as an older brother. He was found drowned in a river from what appeared to be suicide, though the Konoha Military Police believed it to be murder. It was later revealed that Shisui had been ordered to keep tabs on Itachi. Itachi later admitted to Sasuke Uchiha that he had murdered Shisui to obtain the Mangekyo Sharingan, forging Shisui's handwriting on his suicide note with the help of the Sharingan.

Trivia
Shisui's name has two interpretable meanings. Combining the words and, Shisui would mean "Death water", which is a reference to his death by drowning. "Shisui" alone means "'Still water'" or "'Stagnant water'".

Shisui is the only one of the Uchiha Clan whose look has yet to be shown. He had his lover which itachi stole away but then itachi killed her (didn't really kill her she appears in a photo that Madara gives to Sasuke when itachi dies then she comes out of her slumber which itachi placed on her but finds her beloved itachi Uchiha dead.She goes through an emotional breakdown and tires to kill sasuke multiple times but then later commits suicide on itachi's grave post and is later found by naruto uzamaki.)

שיסוי אוצ'יהא