Jeff Shell, C.E.O. of NBCUniversal, Steps Down After Inquiry

Jeff Shell, the chief executive of NBCUniversal, is leaving the company after an investigation into an inappropriate workplace relationship, the company’s owner, Comcast,

In the statement, Mr. Shell said that Sunday would be his last day and that he had had “an inappropriate relationship with a woman in the company.”

“I’m truly sorry I let my Comcast and NBCUniversal colleagues down, they are the most…