Depends on what your plum died of!

If the ground is suspect then I wouldn't advise it.

Tell us how your plum tree died and we will take it from there!

it was ok in the early spring with plenty of growth and masses of blossom. the fruits set then it just started dying off from the graft up leaving a rusty colour under the bark. the rootstock seems to be unaffected. thanks a lot for any help

Your plum tree is of the Prunus family and the nectarine is Prunus persica, same family. So as already said, it is a bad idea to plant a tree or shrub in the same place as one that has failed. Having said, if you are set on planting in the same place, then I would use 'Rootgrow' to set up a barrier when planting.

thanx for that i'll plant it in a new patch just to be safe.