The Choker (also called the Strangler) is a type of Zombie. They are uncommon in SAS: Zombie Assault 2/SAS: Zombie Assault 2 Insane Asylum, but are quite common in SAS: Zombie Assault 3. The SAS 2 version seems to be very similar of Ju On: The Grudge series but legless, and The SAS 3 version also seems to be very similar the Leaper Necromorph from the Dead Space franchise.
Differences between 2 & 3
The Choker sees major differences between SAS 2 and 3. It is much weaker and slower in 3 than it was in 2. Whereas in SAS 2 it can take around 90 bullets or more to kill one with the starting pistol, SAS 3 requires around 10 bullets from the starting pistol. In SAS 3, they are the weakest type of zombie in terms of attack strength (which isn't the case in SAS 2/Insane Asylum).
Also, the original had white skin and a black head, as opposed to the updated pink head and peach skin. The Choker is the most balanced enemy in Zombie Assault 3.
Like the other zombies of Zombie Assault 3, the Choker also has stronger red and green variants.
The L115A1 will kill it in about four shots.
Around ten shots with a low level pistol will kill it. Green and Red Variants have slightly more health which in turn requires more firepower.