Did you carefully scratch away a little bit of the stem to see if it was still green? if so i wouldnt worry too much. it probably wont do much this year just produce leaves.... if there is no green give it a while. my parnter put out my fushias into the cold one day with out telling me and they "died". there was no green at all. i left them to themselves for about 2 months and i noticed a couple of days ago a few small but very much visible green shoots. so dont give up just yet..
however if it really is dead i have no clue on how to get it out....dig down as deep as you can and try to chop must of the roots from the base and pull it out like a tooth??
thats my advice for what its worth...