Legendary radio disc jockey Casey Kasem, who invented the top-40 countdown and served as the longtime voice of Shaggy on the children’s cartoon “Scooby Doo,” died Sunday at age 82. Almost immediately as the news broke, tributes started to pour in, including this emotional one from his daughter, Kerri Kasem:

Casey Kasem (Steve Marcus/Reuters) Casey Kasem (Steve Marcus/Reuters)

“Early this Father’s Day morning, our dad Casey Kasem passed away surrounded by family and friends. Even though we know he is in a better place and no longer suffering, we are heartbroken,” she wrote on Facebook. “Thank you for all your love, support and prayers. The world will miss Casey Kasem, an incredible talent and humanitarian; we will miss our Dad. With love, Kerri, Mike and Julie.”

Ryan Seacrest, who took over the “American Top 40” countdown show from 2004, has frequently talked about Kasem being his idol. He released a statement Sunday that called Kasem’s death a loss for radio listeners and said that when he was younger, he would hear Kasem’s show and “dream about someday becoming a radio DJ.”

[Related: As radio and pop culture splintered, Casey Kasem was keeping it together]

[Related: Casey Kasem, king of the top-40 countdown and ‘Scooby Doo’ voiceover artist, dies]

Many other famous fans also paid tribute on Twitter: