Anna Nicole Smith is too overcome by grief to even talk about the cause of her 20-year-old son Daniel’s death Sunday, just three days after she gave birth to a baby girl, those close to the situation said Tuesday.

New York City-based TrimSpa CEO Alex Goen, for whose product Smith is a spokesperson, told CNN’s Larry King that he had spoken to Smith only two hours before the broadcast. In their conversation, which lasted between 45 minutes and a hour, Goen said the distraught mother was “only coherent for about five minutes.”

“It was a very emotional conversation,” said Goen, who described himself as a friend as well as a business colleague of Smith’s. “She broke down many times. The few times she was coherent she talked about her baby girl. She brightened up for a moment there, but then very quickly started thinking about Daniel and broke down immediately afterwards.”

Asked if he and Smith had discussed the cause of Daniel’s death, Goen replied, “We would not get into that kind of conversation. She was not in that state to talk about the cause.”

He added, “How does a mom deal with that? Most moms never have to deal with the death of a son.” Regarding Smith’s association with TrimSpa, Goen said, “We would love to have her remain with the company. … At this point, we’re really not thinking about that too much. We just want to comfort her. … Her baby girl needs her to be strong.”

King also talked with Smith’s Bahamian obstetrician, Dr. Hubert Minnis, who delivered Smith’s daughter via C-section Thursday in Nassau’s Doctors Hospital. He said Smith had come through the procedure “remarkably” and was “talking quite jovially” when the baby arrived. In her current physical condition, she can travel home to the U.S. “if she wants to, very, very soon.”

But, he said, “emotionally, like any mother who has lost a child, she is experiencing grief. (She) cannot hide such a thing.” He also said that he “was not informed” of the cause of Daniel’s death, which police say took place while the young man was asleep in Smith’s hospital room. “As an obstetrician,” Minnis said, “I would not be managing him.”

On Tuesday Her Majesty’s Coroner Linda P. Virgill told us, “The cause of death is not natural. However, we wish to reserve the cause of death at this time pending the toxicologist examination and report for confirmation of cause of death. Friday is the likely release date for the autopsy and toxicology report.”