updated 04/01/2013 AT 10:00 AM ET
•originally published 03/31/2013 AT 10:45 PM ET
The actor “has voluntarily admitted himself to a treatment facility for substance addiction,” his rep tells PEOPLE. “He graciously asks for your respect and privacy as he takes the necessary steps towards recovery.”
Monteith, 30, has been open about his past struggles with substance abuse. He admitted in a 2011 interview that he had previously entered rehab when he was 19.