From The TimeSplitters Wiki

Nurse Sputum
Unlocked by	Honorary League > Fever Pitch > Missile Bunker with Bronze or Better
Species	Zombie
Size	Normal
Accuracy	N/A
Agility	5
Stamina	5
Fire Proof	2
Shock Proof	8
Default AI	2
Native TimeZone	1994
First Appearance	TSFP
Relations	Nurse Tourniquet (Human form)
Games	TSFP

TS1 Gesture	N/A	TSFP Gesture	Stands with hands and feet pointing out, jumps and says "Oooh, uh-heh. Got any injuries? No? Want some?
TS2 Gallery	N/A	TSFP Gallery	That uniform is going to need a low temperature biological wash--even then I'm sure that some of those stains still won't shift.

Nurse Sputum is a nurse character that is unlockable in TimeSplitters Future Perfect by beating Missle Bunker with a bronze. Her human form is Nurse Tourniquet. She seems to have a disorder, as her arms and legs are held in odd directions. It is unknown if she is indeed a zombie but it is most likely she is. Even though she is a zombie character , she cannot be beheaded.