Transcript for Friend Says Monteith Tried Hard to Keep Addiction at Bay
the new video that surfaced overnight, and the abc news exclusive on c monteith. One of his closest friends speaking with abc's neal karlinsky. Reporter: In a new video posted on youtube, monteith is seen on his flight to vancouver, giving advice to a fan. I'm cory. I'm sheila's friend. And wanted to record this video for you guys to let you know that, stay out of trouble. And stay in school. ♪ Just a small town girl ♪ Reporter: Before he was finn, the jock-turned glee club member he was a lost kid from vancouver island, looking for his direction in life. Who happened to wander into andrew McElroy's acting class. And changed both their lives forever. Off the street, into a room, where acting was happening. And never left. Reporter: Monteith never let GO OF HIS CONNECTION to McIlroy, who became one of his dearest friends. Monteith's death has hit hard. I don't like to talk about it. I don't want him to be a past tense. It's always a shock. I never walked away from cory going, oh, my god, I hope you're okay. Reporter: Mcilroy spoke exclusively with abc news, on the same vancouver street he walked with monteith. The two would often take long walks together, he said. The teen idol sat in on one of McILROY'S ACTING CLASSES JUST Before his death, at this studio. With a hat pulled down low, wanting to soak in the experience without anyone seeing him. He gave no indication of a man slipping back into addiction. The keys of addiction makes you think you're driving the car. And it slowly moves you in the passenger side and it starts to drive. Reporter: Overnight, "glee" co-star jane lynch spoke on "the tonight show." He flew across the country on his nickel to meet with a sick kid. That's the kind of guy he was. Reporter: Monteith, we now know, died of a drug overdose. but McIlroy says he wasn't hanging with a bad crowd. But old friends he acted with years ago. He wanted to sigh his old friends before returning to hollywood for the new season of "glee," and the stardom that even he never quite understood. He said, people love me. I don't know that I deserve it. He was surprised at every compliment he got. And grateful for every compliment that he got. Reporter: For "good morning america," neal karlinsky, abc news, vancouver. What a story.
This transcript has been automatically generated and may not be 100% accurate.