[Baa]

I pick pocketed him a few weeks for a guildie, was most certainly lvl 45 then as assassinate worked on him.

I found he was a bit stingy but after realising he was lvl 45 just kept backstabbing him till I got an assassinate, if I failed to assassinate I ran to zone and tried again. Usually took 4 or 5 tries, he is about a 6 min spawn so then you get another attempt!