Stalker

The Stalker Predator was a murderous Yautja psychopath.

History
The Stalker Predator is a psychotic Predator who's skills are unmatched, a serial killer who only hunts other Predators. Known to stalk and terrorize his prey before the kill, he gets his thrills turning the hunter into the hunted. The blades that adorn his helmet represent his weapon of choice. He has a specially designed blue laser targeting scope that emits no heat traces and is invisible to other Predators' heat vision, making his location harder to detect by other Predator.

Behind the Scenes
The Stalker predator was created as backstory for sideshow collectibles "Stalker Predator Mask" which was designed by artist Steve Wang.

Source

 * Sideshow Collectibles: Stalker Predator Mask