Anna Nicole Smith 'inconsolable' after son Daniel's death: Part 4

When Dannielynn was born, the birth certificate named Howard K. Stern as her father, not Larry Birkhead.
5:01 | 02/11/17

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Transcript for Anna Nicole Smith 'inconsolable' after son Daniel's death: Part 4
of Anna Nicole Smith. Reporter: For 37-year-old Anna Nicole Smith, no amount of exposure is too extreme. But believe it or not, she insists on some privacy, like her relationship with photographer Larry birkhead. Were you in it for the fame and the money? No one ever knew that I was her boyfriend, the whole time we dated. If you look at all the video, I'm in the back carrying my camera bag. Reporter: It's 2004 and Larry says he was happy being on the sidelines and that the secret courtship is serious, with talk of marriage, even babies. Anna always wanted a little girl. That was her dream, and she went from city to city, as far back as the '90s, and she would collect outfits and hope that one day that she could dress her in all these, you know, frilly outfits pink this and pink that -- Reporter: She wanted a girly girl. She wanted that. Reporter: But it's no fairy tale romance, Larry says it's unpredictable and tumultuous. She was a little bit controlling. She wanted you there when she wanted you. Of the roses" because that's what we said was our relationship. Reporter: Why did you stay in the midst of that circus-like atmosphere? I packed a couple times to go. And she was crying, and she said "If you go and pack, you're going to be feeling really stupid because --" and she took my hand and she put it on her stomach. And she said, "Because we're going to have a baby." Reporter: His dreams of becoming a father were coming true. Then nearly six months into the pregnancy, Larry says it's vintage Anna Nicole, another fight and this time she hightails it out of Los Angeles and ends up in the Bahamas. He says it's a calculated plan to keep him out of the picture. Soon after, Anna Nicole shares her pregnancy with the world in this video posted on her website. Let me stop all the rumors, yes, I am pregnant. I'm happy. Reporter: Back in the U.S., Larry is left to wonder about the fate of his unborn child. You were concerned about the drugs she was taking. I was concerned that the medications that she was taking and how -- what impact it would have on our child at the time. Reporter: Then, adding insult to injury on September 7th, 2006, Anna Nicole gives birth to their baby in the Bahamas. And Larry is nowhere near the delivery room. But a video camera sure is. Anna Nicole later sells this footage and an interview to entertainment tonight for a reported $1 million. I had to watch my own child being born on television, and they showed all of it, the c-section, everything. Reporter: But fate is about to cruelly intervene. Anna Nicole's 20-year-old son Daniel heads to the Bahamas to meet his new sister, only three days old. While at the hospital, he takes a nap in the bed with his mother. And then, an unimaginable tragedy.he wakes up and she turns to him and he's dead. Fiction couldn't imagine a moment like that. A shocking event. Anna Nicole. Reporter: It was determined that Daniel died accidentally from a lethal combination of prescription drugs. Anna Nicole's close friends Alex and Monique Goen immediately rush to her side. Daniel was the first person in her life that she was certain unconditionally loved her. And she lost him. What do you do? What do you say? There's nothing that you can say. Reporter: Larry says Anna Nicole, in her grief, is inconsolable. At the funeral, she tried to climb into the casket. She would see a cloud she thought was the shape of Daniel. And she would tell people that she wanted to be with him. I knew that Anna would be in no shape on her own after losing Daniel, as close as they were, to take care of my daughter. Reporter: But proving that the baby is his daughter will be a messy, public battle. Remember Howard K. Stern, the lawyer/best friend? He goes on "The Larry king show" with this surprising revelation. So you are the father? Yes, sir. Reporter: And the name on the baby's birth certificate reflects that. Dannielynn hope Marshall stern. Larry's lawyer braces for a fight. Can Anna Nicole Smith not simply submit to the tests necessary to settle the question of who is that little girl's father? Reporter: While Larry himself goes on TV. Now you're going to meet a man who says he is fighting to be a father. Reporter: Including with me on "20/20" to make his case. Was there any question in your mind about whether this was your child? No. I said, "This is mine, right?" She's, "Yeah, dummy, I'm not a whore." Reporter: In fact, he claims Howard K. Stern was behind his breakup with Anna Nicole. He would fill her head with ideas, negative thoughts about me. Reporter: So you think he was out to sabotage your relationship? Oh, most definitely.

This transcript has been automatically generated and may not be 100% accurate.

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