This is heartbreaking—after the untimely death of Cory Monteith in 2013, the actor's mom, Ann McGregor is speaking publicly for the first time.

In an interview with ABC News that aired on Good Morning America on Thursday morning, June 17, McGregor, 63, finally opened up about her son, whom she called "baby bear," and his tragic demise.

"In the last few days, I'm beginning to accept it, the loss is horrendous," she said. "Until three days ago, I couldn't look at a picture of Cory, so there's been progress."

The Glee actor passed away on July 13, 2013. The autopsy ruled that he died due to a "mixed drug toxicity," which included heroin and alcohol.

McGregor also opened up about Monteith's bout with addiction in the sit-down interview. "[When] Cory was 15, he did a code blue, and I think that was the turning point," she shared, recounting another overdose. "He had a lot of emotional things he was trying to figure out-a 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."

She emotionally remembers being with Cory after that first overdose. "All I did was stare into his eyes and hug him and look at him because I had this feeling I wasn't going to have him my entire life."

McGregor also said in the interview that she still keeps in touch with Monteith's then girlfriend, Lea Michelle, who was his Glee co-star. "She texts and e-mails me. She's hurting too... you see the sadness. I know her pain," she said.

Monteith voluntarily entered himself into rehab in March 2013, months before his death, to get his substance abuse issues under control, so his passing shocked the world, and McGregor confessed that no one in her son's life was able to help him. "I don't think we have the power to change the choices they're making. I think with the kind of connection Cory and I had, if we couldn't prevent that situation, I don't have the answer," she said.