Energy drain, fatal dmg, & negative levels, how would this go?

[GM Chyro]

Hello all, i'm doubting on a matter.

Situation is this:
A PC is down, (one of two alive but both KO) and the foe (vampire) responsible had three comrades killed by said PC in one fell swoop, and still thinks the other one (who has fast healing and will be back up in a few turns) is dead.

The PC is lvl 9, what would happen if further attack damage, from a very vengeful vampire, would kill the PC?

Does the PC become a spawn, due to 4 negative levels robbing them of their last bit of health?

Or,

Does the PC just die from HP loss from energy drain, but doesn't turn into a spawn since negative levels did not equal their hit dice?

Thanks in advance.

[RealAlchemy]

Based on the monster description, it would depend on whether the vampire kills the PC using energy drain or blood drain, not on whether the negative levels equal the PC's hit dice. If the tactics say the vampire uses a weapon, it would probably strike with that before making spawn.

[GM Chyro]

No description was given, as it's a sorceress vampire.
Only if she were in melee with an opponent.

I guess that means a slam attack.