Need Help! Motionless in white band question.?

Ok, so i just recently started listening to this band (motionless in
white) And so i dont know the band members names too well.
In the music video Ghost in the mirror (link below) who (besides
Chris) is the other person they show singing? And Is he a former
member or is he still in it?

Link: http://www.youtube.com/watch?v=ydVQt5rkIhI

Thanks