Destroy objects with same Owner

Options
Hey guys,
I just did the Photon2 tutorial, but there is a problem I cant solve.
When a new player joins the game, the character is instantiated twice, one is acting normal and also controllable, but the other just flies on its spawnpoint. The player can only controll the first one.

Question:
So I want simply to destroy all disturbing objects, until there is only one left, that the owner has. It would help if I could destroy in some way the character that is not controllable.
I am not experienced at all and couldn't find something in the internet to solve this.
I would really appreciate if somebody could help me.