Matthew Perry's Legacy: As fans mourn the loss of Matthew Perry, the "Friends" star's castmates remember him with love and admiration. From Courteney Cox's heartfelt Instagram post to Jennifer Aniston's emotional tribute, the bonds formed on the set of the beloved sitcom are evident. David Schwimmer and Lisa Kudrow also share their memories, and the legacy of the late actor lives on through the Matthew Perry Foundation, dedicated to helping those battling addiction.