Islamic State must show the evidence that Japanese hostage Mr. Kenji Goto is still alive.

Islamic State must show the evidence that Japanese hostage Kenji Goto is still alive.
Because many people of the world said, "Mr. Kenji Goto was killed."
I.S. had better put the movie picture that Mr. Goto is still alive on Internet.
If I.s. can't that, People can't trust I.S..
It's very important thing to negotiate each other.
Hurry up leader of I.S.