I've wondered about that too - and am just now wondering whether we are operating in two universes simultaneously, and in universe 1 he's killed by Melody Pond and in universe 2 he's killed by River Song... OOOOOooohhh, yes! Because in the "Mels" universe that we're perhaps in right now Melody Pond killed the Doctor and has the big reputation (thus the knowledge of the Tessellecta crew) whereas the name River is clean. But in a "River" universe (which we were perhaps in before when the Dalek "looked her up"), River Song is in jail for killing the Doctor, and Melody Pond would just be a girl from Leadworth. That's sufficiently mirror-y, I suspect? :-\
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OOOOOooohhh, yes! Because in the "Mels" universe that we're perhaps in right now Melody Pond killed the Doctor and has the big reputation (thus the knowledge of the Tessellecta crew) whereas the name River is clean. But in a "River" universe (which we were perhaps in before when the Dalek "looked her up"), River Song is in jail for killing the Doctor, and Melody Pond would just be a girl from Leadworth. That's sufficiently mirror-y, I suspect? :-\