From The TimeSplitters Wiki

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 undead but it is most likely she is. If she is an undead character she cannot be beheaded like the others.