"We have concluded our investigation and Mark will not be returning to 'The Royals'," a spokesperson for Lionsgate TV said in a statement, reported Variety.
"The fourth season of the show has already completed production and will air as scheduled on E! in the spring," he added.
Trouble began for Schwahn after the cast and crew of the 2003 hit show "One Tree Hill" released a joint statement in support of writer Audrey Wauchope, who took to Twitter about harassment from the 51- year-old creator without naming him.
"The Royals", a contemporary royal drama featuring actor Elizabeth Hurley, had wrapped its production on fourth season in September.
The female members of the team said that they had soon realised they had to handle the situation on their own.
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