Zombie Researcher

Zombie Researchers are the researchers onboard the B.S.L Research Station that have been infected by the X. They appear only on the Main Deck. Like several other creatures encountered that have combined DNA, they are likely a combination of human DNA and that of a slime creature. Zombie Researchers are weak compared to many other X mimicked creatures that Samus encounters, being defeated by a single shot from the Power Beam. After being destroyed, Zombie Researchers release either a Template:X or a Template:X.

Although X-mimicked humans seem to transform into Zombie Researchers, one dead human mimicked by the Wide Beam-wielding Hard Core-X did not transform into a Zombie at all. Instead, it looked like a normal human before it transformed to its true X form.

Manual

Manual info from Metroid Fusion

Zombie Researcher:

These shambling creatures are probably the result of X parasite absorbing a slime creature's DNA then infesting the staff researchers. They're remarkably similar to zombies.