Transcript for Kevin Hart posts public apology amid alleged extortion plot
We are back with that extortion plot targeting Kevin hart. He claims someone was demanding millions of dollars over a sexually suggestive video and now posting an emotional apology to his wife and family. ABC's linsey Davis has the story. Good morning. Reporter: Good morning, George. Just last month Kevin hart took to Instagram to wish his wife who he often refers to as his rib a happy one-year anniversary. Then over the weekend he took to Instagram again. This time to apologize to his pregnant wife for, quote, making a bad error in judgment. While comedian Kevin hart is known for cracking jokes -- I know. Reporter: As the funny man is taking a serious turn speaking out trying to get ahead of what his reps are calling a failed extortion attempt. I feel like I have a target on my back and because of that, I should make smart decisions. And recently I didn't. Reporter: The FBI is reportedly investigating a video showing hart with a woman who isn't his wife. An extorter allegedly demanding millions of dollars from hart. One of the highest paid comedians in the world. I know that I'm going to hurt the people closest to me who I talked to and apologized to. Being my wife and my kids. Reporter: Hart beat the extorter to the punch posting this video on his Instagram account apologizing to his family and wife eniko who is 31 wecks pregnant with their first child. I'm not going to lie in person to have financial gain off my mistakes and in this particular situation that's what was attempted. I said I'd rather Fess up to my mistakes. Reporter: The 38-year-old with two children from a previous marriage wed his longtime girlfriend last year but since then rumors of hart's infidelity have swirled. But in a radio interview last year, he said cheating is not a game he wants to be involved in. Why risk it? What am I going -- -- it's not worth it. Reporter: The central intelligence star. In or out. Then I'm out. Reporter: Isn't the first funny man to fight back against extortion. I have had sex with women who work for me on this show. Reporter: In 2009 David Letterman revealed live on the show while married he had several affair with some of his staffers after a former CBS producer attempted to blackmail him for $2 million. That producer pled guilty to extortion charges. Anybody that's being extorted should never pay. You have no control at all as to whether they're going to release the information or not. Reporter: As for hart, he's owning up to his mistakes. I'm not perfect. I'm not going to sit up here and say I am or claim to be in any ware, shape or form. Reporter: Hart also posted a written message to his wife and kids saying I got to do better and I will. Just last month his ex-wife accused him of cheating on her with his current wife. At that time he used social media to simply laugh off the accusation, not so much this time. George. Different tact. Let's talk about it with Dan Abrams. So, we just saw in the piece it worked for David Letterman. Will it work for Kevin hart? I think it's what he has to do is he has to come clean, right? You can't start paying off extortion demands and open yourself up to getting another demand in six months from that. So I think that he had no choice here but to do exactly what he did, which is go public, take responsibility. Take the hit. And now help lead this investigation. Well, that's the question. Do you turn it around? Is this a real plot that can be prosecuted. Look, most of the time extortion is a state crime. It seems that the FBI in this case is investigating. That could be because it was across state lines or because it's on the internet, et cetera. Those are reasons it could become a potentially a federal crime but all 50 states have extortion laws. You don't have to threaten someone physically to potentially be guilty of extortion. You can threaten to Hewlett mill yacht someone and threaten to put something out there publicly to disclose that you're not being faithful to your wife in exchange for money. So it has to be a demand for something of value and threatening to do something horrible. But then the push, he has to weigh getting some sort of legal justice there and keeping it in the news forever. My guess is right now he cares a lot less about legal justice, would like this to go away but the legal justice has to go hand in hand with this. The minute that he decides I'm going to go public with this, his position has to be and I'm going to be helping. Take it all the way. In the context of this investigation. It will be interesting to me, though, to continue to follow whether this just becomes a federal investigation or whether it becomes state because as I said before, most of the time extortion is something that's investigated as a state crime. Okay, Dan Abrams, thanks very much.
This transcript has been automatically generated and may not be 100% accurate.