The Stalker is a variant of the Watcher located in the less corrupted areas. The Stalker is rare and seems to attack anybody that gets in it's path or makes a physical contact. Despite being a stalker, The Stalker constantly stalks it's prey and kills only if an interaction has been made. The Stalker also attempts to lure it's prey to make contact.
The Stalker makes it's first appearance in coop_omega3 (twice) and second and last appearance in coop_omega4.