Kageyama

Location: A room over from where Ushijima was.
Method: Stab to the jugular.
Last Words: TKindaichi you need to go on, no matter what. And I c-care about you... Even if I didn't get to show you. And..
Iwaizumi-senpai thank you, don't blame yourself...you did more than enough.

Hint: "Only."