Joe Ruby, the co-creator of iconic cartoon series Scooby-Doo, has died aged 87.
Ruby died of natural causes at his home in California on Thursday.
"He never stopped writing and creating, even as he aged," said his grandson Benjamin Ruby.
Ruby co-created the long-running cartoon series with his creative partner Ken Spears.
In a statement to the BBC Warner Bros' animation president Sam Register said Ruby "made Saturday mornings special for so many children, including myself".
"He was one of the most prolific creators in our industry who gifted us some of animation's most treasured characters and it was a thrill to host him at our studio," he continued.
Reactions to Ruby's death have taken over Twitter with fans posting their own obituaries to the artist.