From The TimeSplitters Wiki

Mordecai Jones is a cyborg in the Machine Wars level of TimeSplitters Future Perfect. He helps you from the beginning of the level to the part where you enter the factory, at which point he either dies or stays behind. He is already unlocked for Arcade mode, and when selected, a buzzing sound is heard and he swats around as if a fly is buzzing around him. It is also interesting to note that he is related to Elijah Jones from TimeSplitters 2.