Cory recorded the message on a plane from Japan to Vancouver, taking the video for a flight attendant's boyfriend's daughter.
It was a really sweet gesture and more proof that Cory was really a gracious and giving guy.
In the video, Cory says, "I wanted to record this video for you guys just to let you know to stay out of trouble and stay in school."
Meanwhile, new details are emerging about how Cory's girlfriend, Lea Michele, heard the horrible news, via a phone call on July 13.
A source shares the details of her reaction with Us Weekly, noting that Lea has understandably been "inconsolable."
Another insider tells the site that she's "not doing great" and is "totally devastated."
Gallery | R.I.P. Cory Monteith