CNN's troubles continue to mount as the network's president, Jeff Zucker, shocked the cable news industry with a surprise resignation on Wednesday.

The reason? An undisclosed sexual relationship with a top-ranking colleague who also used to be an aide to the serial sexual harasser and now former New York Democratic Gov. Andrew Cuomo.

Reports noted that Zucker failed to admit to network officials investigating then-host Chris Cuomo that he had a relationship with CNN executive Allison Gollust, who at one time served as Andrew Cuomo's communications director.

In a memo to staff on Wednesday, Zucker said he should have told network officials about the relationship but simply declined to do so.

"As part of the investigation into Chris Cuomo's tenure at CNN, I was asked about a consensual relationship with my closest colleague, someone I have worked with for more than 20 years," Zucker said.

"I acknowledged the relationship evolved in recent years. I was required to disclose when it began but I didn't. I was wrong.

"As a result, I am resigning today," the now former CNN president added.

"I came to CNN on January 28, 2013. Together, we had nine great years. I certainly wish my tenure here had ended differently. But it was an amazing run. And I loved every minute.