Earlier this week, Warner Bros. Chairman and CEO Kevin Tsujihara came under fire in the wake of a report that he promoted an actor with whom he was in a relationship. Now, Tsujihara has issued an apology amid Warner Bros.' investigation into his behavior.

In a memo to his staff, as obtained by The Hollywood Reporter, Tsujihara expressed regret over "mistakes in my personal life that have caused pain and embarrassment to the people I love the most," as well as actions that "have caused embarrassment to the company and to all of you." He revealed that Warner Bros. has hired a third-party law firm to look into the incident. He has agreed to "cooperate fully with this investigation."

RELATED: Warner Bros CEO Reportedly Promoted Actor During Sexual Relationship

Tsujihara was reportedly involved in a sexual relationship with British actor Charlotte Kirk, in exchange for Tsujihara helping to secure Kirk meetings and auditions with studio executives for roles in various Warner Bros. movies and television series. The report stemmed from hundreds of leaked text messages between Kirk, Tsujihara, director Brett Ratner and Australian billionaire James Packer (Ratner's partner in RatPac Entertainment), which detail the chain of events that began on Sept. 27, 2013.

Tsujihara's statement appears in full below:

Dear Colleagues,

By now, you’ve all seen the news reports from earlier this week.

I deeply regret that I have made mistakes in my personal life that have caused pain and embarrassment to the people I love the most. I also deeply regret that these personal actions have caused embarrassment to the company and to all of you. I realized some time ago you are right to expect more from me and I set a course to do better. That journey continues.

I am so proud of the great work you do every day. Together, we have built a company that is the gold standard in our industry. Warner Bros.’ culture is as important to our success as our business model. We need to continue the hard work we’ve done over the years to create a workplace where everyone feels included and heard. To that end, I’ve asked HR to make additional accommodations if anyone needs to talk.

Since WarnerMedia’s leadership became aware of details surrounding this situation some time ago, it has carefully reviewed the matter and handled appropriately, including having engaged a third-party law firm to conduct a series of inquiries. Following these most recent news reports, the company will again work with a third-party law firm to review the situation, and I will cooperate fully with this investigation.

Please don’t let my mistakes become a distraction. It’s important that we all stay focused on our work—and part of that is creating a culture and company of which we can all be proud. Thank you all for everything you do to make that happen every day.

Sincerely,

Kevin

Tsujihara is slated to gain control of Cartoon Network and Warner Bros. studio in the new WarnerMedia following AT&T's $85.4 billion acquisition of Time Warner.