Los Angeles ? The joy of giving birth turned to horror for ex-Playboy Playmate Anna Nicole Smith when she discovered her 20-year-old son dead in her hospital room just hours after he had come to visit her and his new baby sister, police in the Bahamas said Monday.

The cause of Daniel Smith’s death had not been determined Monday. The young man apparently collapsed early Sunday while sitting in a chair in his mom’s maternity ward room in Doctors’ Hospital in Nassau.

“It would appear from our report that the mother had gotten up, saw him in the chair and he appeared to be sound asleep,” said Reginald Ferguson, assistant commissioner of the Royal Bahamian Police Force.

“She tried to wake him up, he was unresponsive, and she sounded the alarm,” Ferguson said.

But the model’s reps gave a different version of events. They said Daniel “had been found not breathing, in bed” Sunday morning and had “visited Anna and his new half-sister the night before he passed away,” according to a statement issued by a spokeswoman for TrimSpa, the diet pill Anna Nicole Smith endorsed.

“Anna Nicole is absolutely devastated by the loss of her son. He was her pride and joy and an amazing human being,” said the statement, part of which was also posted on Smith’s Web site. “We have yet to learn the cause of death, but do not believe that drugs or alcohol were a factor,” the statement said.

The death remained under investigation. “I am not in a position to determine cause of death at this time,” coroner Linda Virgil said, saying she expected an autopsy report later in the week.

Anna Nicole Smith and her son, Daniel Smith, 13, leave a federal courthouse in Los Angeles in this Oct. 27, 1999, file photo. Daniel Smith, now 20, died Sunday in the Bahamas, where he had gone to visit his mother, who had just given birth last week to a baby girl.

Anna Nicole Smith, 38, gave birth Thursday at Doctors’ Hospital to a 6-pound, 9-ounce girl whose name has not been revealed. The baby’s father is believed to be celebrity photographer Larry Birkhead, Smith’s recent ex-boyfriend who claimed paternity last June.

“I have absolutely no comment on the reports of a childbirth” or “any other events,” Birkhead said in a message on his Web site.

Daniel was Smith’s son by her first husband, Billy Smith, whom she wed as a teen and divorced in 1987.

“It’s so sad. I hated that it happened. He was so young. I’m sort of in shock right now,” Billy Smith told the syndicated TV show “Extra.” Billy Smith had not seen his son since Daniel was 2 years old and last spoke to his ex-wife in 1996, “Extra” said.

Smith has credited her son, who was reportedly a straight-A student, with helping her get off painkillers when she became addicted a few years ago and he appeared frequently on her former E! network reality series, “The Anna Nicole Show.”

He also had bit parts in her films “Skyscraper” and “To the Limit.”

Smith, a former topless dancer who started life as Vickie Lynn Hogan, is the widow of Texas oil tycoon J. Howard Marshall, whom she married in 1994 when she was 26 and he was 89. He died a year later, touching off a long-running court fight between Smith and Marshall’s younger son, E. Pierce Marshall, over the estimated $1.6 billion fortune.

In May, the U.S. Supreme Court ruled Smith could pursue part of her late husband’s fortune through a fresh claim in Federal Court. A month later, E. Pierce Marshall died at age 67. It’s not clear where the inheritance battle will go from here.