The 3rd person who has it

[calvin]

Uchiha Shisui
Killed by: Uchiha Itachi and made it look like a sucide
Manga: Ch.222, pg.4 *Mentioned*
A talented member of the Uchiha Clan he was found drowned in the Nakano River with a suicide note saying, Im tired of the duties, there is no future for Uchiha and for me I cannot walk out the path any further. However, many believe he wouldnt be the type of person who would just kill himself and anyone with a sharigan can copy his handwriting as well. So the Police Force are performing an investigation and they have their hunches that Itachi would be responsible. In fact later Itachi admits to killing his best-friend to reach a new level of sharigan

that solves everything. i think
taken from www.narutoinfo.com

[Mut]

Originally posted by: calvin
Uchiha Shisui
Killed by: Uchiha Itachi and made it look like a sucide
Manga: Ch.222, pg.4 *Mentioned*
A talented member of the Uchiha Clan he was found drowned in the Nakano River with a suicide note saying, Im tired of the duties, there is no future for Uchiha and for me I cannot walk out the path any further. However, many believe he wouldnt be the type of person who would just kill himself and anyone with a sharigan can copy his handwriting as well. So the Police Force are performing an investigation and they have their hunches that Itachi would be responsible. In fact later Itachi admits to killing his best-friend to reach a new level of sharigan

that solves everything. i think
taken from www.narutoinfo.com

hmmm, no. it doesn't solve anything. in ch 225, itachi talks about how there WILL be two more people who can awaken the mangekyou sharingan. shisui cannot be one of the two because he is dead already.