All of a sudden Rasheed is on my team?

I was starting my second season with the Mavs when I am resigning my players, etc.. Then I look at my roster to reorder it, and I see Rasheed Wallace, and I look at his picture to confirm this is the real one.

How the hell did he end up on my team? I liked my team; I had made some nice trades. Now my whole rotation is screwed over.

Please help.

Thanks

just release him if you dont want him, another team will surely pick him up.

it must be that you only went to resign players and simulated the sign free agents phase so the computer AI signed what it thought you might want.