Voice-over actor Jim Ward, best known for his recurring roles on the Nickelodeon series "The Fairly OddParents," died Wednesday. He was 66.

Ward died Dec. 10 following a battle with Alzheimer's disease, the actor's agent, Arlene Thornton, confirmed to USA TODAY Thursday.

"His ability to improvise on the spot, as well as his dead-on impressions, were beyond impressive," Thornton said in a statement. "He was a one-man comedy show every time he came to the office to do his auditions. We will miss him dearly, and we will never forget the joy he brought to our lives on a daily basis."

Despite his TV pedigree, it was the world of gaming where Ward's voice-over career truly took off. In the early '90s, the actor appeared in several video games, including "Spider-Man vs. The Kingpin," "Grim Fandango," "King's Quest: Mask of Eternity" and "Star Wars: Episode I – The Phantom Menace."

Ward expanded into film and TV in the late '90s and early 2000s with roles in "Casper Meets Wendy," "Spirited Away" and "Totally Spies!" The voice-over actor would later become a staple on Nickelodeon during the network's Y2K heyday, appearing on the series "The Fairly OddParents," "Hey Arnold!", "Danny Phantom," "My Life as a Teenage Robot" and "Avatar: The Last Airbender."

On "Fairly OddParents," Ward played business tycoon Doug Dimmadome and news anchor Chet Ubetcha, in addition to various other characters, over the course of a 95-episode stint.

In 2009, Ward's performance as Stoker in the sci-fi action series "Biker Mice from Mars" won him a Daytime Emmy Award for outstanding performer in an animated program.

News of Ward's death comes shortly after the death of voice-over actor and fellow Nickelodeon alum Jeffrey Garcia, who voiced Sheen Estevez on "The Adventures of Jimmy Neutron, Boy Genius."

Garcia, 50, was pronounced dead on Wednesday after being taken off life support Tuesday night following a recent hospitalization for pneumonia.

Fans mourn 'childhood GOATS' Jim Ward and Jeffrey Garcia

The deaths of Ward and Garcia set off a wave of mourning on social media, with many fans sharing nostalgic tributes to the iconic voice-over actors.

"I just got hit with TWO back-to-back childhood GOATS dying on the same day! You've got to be kidding me " @trevorstudies wrote on X. "It's a sad, sad day for the world of cartoons."

"Rest in peace Jim Ward and Jeffery Garcia," @Popple789 commented. "You both had so many characters that made my childhood light up."

"The one-two punch of Jeff Garcia and Jim Ward passing away in the same day hurts a bunch," @A3Dnazrigar wrote. "Rest in Peace to both and prayers to their families."

"Jim Ward AND Jeff Garcia passed away yesterday??? We lost Doug Dimmadome and Sheen Estevez within hours of each other?!" @DDrake619 commented. "My inner child hurts "

"First Jeff. Now Jim. These two voice actors changed the way I love my childhood for playing iconic characters," @ebf_music wrote. "Much love and R.I.P. to both Jeff Garcia and Jim Ward for shaping our worlds in our childhoods."

This article originally appeared on USA TODAY: Jim Ward, 'Fairly OddParents' voice actor, dies at 66

Reporting by Edward Segarra, USA TODAY / USA TODAY

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