Jamie Horowitz was let go as Fox Sports president of national networks on Monday.

“I regret to inform you that Jamie Horowitz, President of National Networks for FOX Sports, will be leaving FOX Sports effective immediately,” Fox Sports president Eric Shanks wrote in an email to employees, according to the Sports Business Journal. “We realize this news may come as a surprise for many of you, but we are confident in this decision.”

The move comes a week after Horowitz announced layoffs of its writers and that Fox Sports Digital would be moving to an all-video format.

No specific reason was given for the dismissal of Horowitz, who joined Fox in 2015 following a promising career at ESPN and a brief stay with NBC’s “Today.” His bio page on Fox’s website returns a “Page Not Found” result.

“Everyone at FOX Sports, no matter what role we play, or what business, function or show we contribute to — should act with respect and adhere to professional conduct at all times,” Shanks continued in his memo to staffers. “These values are non-negotiable.

“Until Jamie’s replacement is named, I am stepping in to handle his former responsibilities including programming, marketing and scheduling for FS1 and FS2, as well as digital. All of these functions will now report directly to me.

“We understand how difficult this will be for many of you, but in these times it is important that we remain unwavering and focused in continuing the great work of FOX Sports.”

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Horowitz’s makeover of Fox Sports 1 centered around the “Embrace Debate” style of television where talking heads opine on topics of the day. He was instrumental in Fox’s signing of Skip Bayless and Colin Cowherd away from ESPN.