According to ShowBizPizza.com, a Chuck E. Cheese fan site, the man who voiced the mascot in restaurants and commercials since 1993 learned of his replacement only after coming across ‘‘Chuck’s Hot New Single’’ online and realizing it was sung by someone else. The fan site late last week published a Facebook post by Duncan Brannan, the mascot’s former voice.

Brannan could not be reached for comment. But in the post, he writes that part of his assignment when he first took on the role was to transform Chuck E. Cheese from ‘‘a joke-telling, sometime off-color New Jersey rat’’ to a lovable, mainstream mouse.

He notes that there were various signs in recent months that suggested he was being pushed out, but that he was assured by the company that he was still the voice of Chuck E.

The Facebook post was republished by The Dallas Observer this week.

CEC Entertainment says that Brannan wasn’t fired but that it simply ‘‘chose to utilize new voice talent’’ for its ad campaign. The company said Brannan, a freelancer, is still in contract with the company to provide entertainment in its restaurants.

The new Chuck E. Cheese that launches this week will be voiced by Jaret Reddick, the lead singer for the pop-punk bank Bowling for Soup. The Chuck E. Cheese Facebook page now shows a silhouette of a cartoon mouse playing a guitar.

The first Chuck E. Cheese’s Pizza Time Theatre location opened in 1977 in San Jose, Calif. According to ShowBizPizza.com, the idea for Chuck E. came from a generic mascot costume that was acquired by the founder, Nolan Bushnell, who also co-founded Atari and Pong. Executives originally considered calling the restaurant ‘‘Rick Rat’s Pizza’’ but a PR agency figured a rat would be a bad mascot for a pizza chain.