CBS' investigation focused on allegations that surfaced during the past few years, according to The Hollywood Reporter.
Najera has helmed the showcase for the past 13 years. The last showcase was held in January 2017.
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"In March 2017, CBS became aware of inappropriate comments made during the production of the Diversity Comedy Showcase, and remedial action was taken at that time, which the company felt was appropriate to the matter.
"Subsequent information has recently emerged. After looking into these reports and a discussion with Mr Najera, he has resigned from his role with the Diversity Comedy Showcase," a spokesperson for CBS said in a statement.
According to the sources, the first complaint arose last February. The network investigated the incident and disciplinary action was taken immediately.
Recently, CBS received new information which triggered a fresh investigation. Among the complaints were a 2009 incident in which he allegedly said he and his wife were in an open relationship, implying to the performer that he was interested in pursuing a relationship, as well as a 2014 incident in which he was accused of making lewd comments to a performer.
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