By Selena Hill (staff@latinospost.com) | First Posted: Jul 18, 2013 02:50 PM EDT

A "Glee" fan has posted what is believed to be Cory Monteith's final video which he recorded on a recent flight to Vancouver.

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In the 15-second clip, the "Glee" star is seen giving a fan advice while seated on an airplane flying from Japan to Vancouver. He was asked by a flight attendant named Sheila to record a video message to her boyfriend's daughter, Mallory. His advice is short and sweet: "Stay out of trouble. And stay in school," he says.

According to the coroner's office, the 31-year-old actor died on July 13 from a "mixed drug toxicity" involving heroin and alcohol, reports NBC News. He was found dead in his Vancouver hotel room on Saturday.

"Good Morning America" reports that Monteith sat in on one of Andrew McIlroy's acting classes in Vancouver just before his death. McIlroy was an acting teacher who became a dear friend.

"I don't want him to be a past tense," McIlroy told GMA, breaking up about the death. He said Monteith gave no indication of slipping back into addiction. "I never walked away from Cory saying, 'Oh my God, I hope you're OK.' "

"Glee" co-star Dianna Agron is also remembering Monteith, saying he was "one of the most generous and kind people" she had ever encountered.

"I have never lost a friend. In this difficult time, I am leaning on all of the wonderful memories we shared with Cory, how many ways he was able to make us smile. Glee was a gift to all of us. It gave us a family in this industry. We really cut our teeth and grew up on this show," she said in a statement, according to USA Today.

"In playing underdogs, we learned that we had dug into the hearts of our viewers and that we could stay there. Cory is so deserving of that place in everyone's hearts."

The 27-year-old actress continued: "He was one of the most generous and kind people that I have ever met. He had a smart, curious mind, he was an enormous talent," she said. "He was loving to not only me, but my family. My heart goes out to his family, to Lea [Michele], to everyone that is struggling with the loss of our friend."

"We will miss you Cory," she said. "We will always carry a piece of you with us."

Watch Cory's last video below:

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