What do you mean by "theft by wire fraud"? As far as I understand, "wire fraud" has almost nothing to do with wire transfers.
These situations can be reversed if discovered fast enough, but after a few hours the funds are moved internationally and you're very unlikely to get your money back.
Technically kalzumeus might be right, however practically it almost always makes sense to think that wire transfer is final, and treat it that way. If a con man tricks you into wiring funds to a wrong address, it is quite likely gone. However with credit card payments you can be more relaxed, and so on.