I wish to change the model when there is the death animations.
It is possibile? Perhaps some replace or morph functions. In this way , I could put a impressive death sequence as an exploding or trasforming body

of course. Just use an ent_morph function in your model's death action. Or, are you using the templates? In that case, I don't know... I'd use the templates forum instead.

Notice that it is written in the 3DGS profane bible that the function ent_morph travels at tortoise speed.

Is not possible to build a model using different meshes , I guss.