Haim died Wednesday at the age of 38 after battling an addiction to drugs for most of his life. The cause of his death has not yet been determined.
Green, Haim's fellow former child actor, co-starred in TV's "Buffy the Vampire Slayer," as well as the films "Can't Buy Me Love," "Can't Hardly Wait," "Rat Race," "Without a Paddle," "Old Dogs" and the "Austin Powers" trilogy.
He worked with Haim, star of the films "Lucas," "The Lost Boys" and "License to Drive," on the movie "The Double 0 Kid" and the TV series "Robot Chicken."
"As people get older and fall out of the spotlight, people's memory of them changes. (Haim) was a really sweet and earnest performer, and that came through in everything that he did," Green told EW.com. "Whether it's 'Silver Bullet,' 'Lucas,' even 'Lost Boys.' He really just loved performing so much and wasn't cynical. I just hope that people will always remember the kid as somebody who was a really good actor and loved performing and just got caught up."