Does Dumbledore have a horcrux?

[Maria Elmvang]

No: HPFGUIDX 143603

I have recently heard a very interesting theory, which I would like to put to you. I don't know if I agree with it myself, but I'd never heard it before, so I was interested in hearing what other people thought of it.

Snape (DDM! of course ;) ) killed DD knowing that he (DD) had at some point killed somebody and created a horcrux....

Is this at all conceivable?

Maria