Cory Monteith's mother Ann McGregor sat down for an interview with Good Morning America, and this is the first time she's spoken publicly about her son's shocking death, which was almost a year ago to the day.

McGregor filmed the segment a few days ago in her hometown of Vancouver, British Columbia, and we almost got teary watching her talk about her late son, who died on July 13, 2013 at the age of 31 in a Vancouver hotel. "The loss is horrendous," McGregor said solemnly. "Until three days ago I couldn't look at a picture of Cory… So there's been progress."

According to an official autopsy, the Glee star's cause of death was a "mixed drug toxicity," which included heroin and alcohol. "[When] Cory was 15, he did a code blue, and I think that was the turning point," McGregor said when discussing Cory overdosing as a teenager. "He had a lot of emotional things he was trying to figure out -- lot of it was he really wanted a relationship with his father. I think when a child gets invalidated they keep reaching even harder. They want to find out why." (McGregor and Monteith's father Joe are divorced, and after their separation he became estranged from the family.)

"I don't think we have power to change the choices they're making," McGregor continued. "I think with the kind of connection Cory and I had, if we couldn't prevent that situation, I don’t have the answer." McGregor added that she still speaks to his former girlfriend, Lea Michele and said, "She's hurting too… you see the sadness. I know her pain."