Corpse Malevolence( Ghostwalk, p. 29)
You can possess and animate dead bodies.
Ghost Ride (Gh) ,
As Ghost Ride, except that you may possess a relatively intact corpse (sufficient to make a zombie). You may not possess corporeal undead with this ability. You use the corpse's physical ability scores, modified as follows: Str -2, Dex -4, Con — (the corpse has no Constitution score). The corpse does not get a saving throw to resist your possession attempt unless it is being held by another creature. You are still subject to the time limit of the Ghost Ride feat.
Possessing a corpse allows you to use its natural abilities, but not any other abilities it had in life that required special knowledge or skill, including feats, skills, spells, or extraordinary, spell-like, or supernatural abilities. The body gains no benefit from any of its character levels (so possessing a human corpse results in a body with 1 Hit Die). It has hit points equal to the average for a creature of its type, not including any Constitution bonus it may have had when alive.
You give the body a semblance of life, but it is not truly alive and continues to decay at a normal rate. The body is not undead and does not use undead Hit Dice.