SALT LAKE CITY (Reuters) - A visibly upset Elizabeth Smart stormed out of her accused kidnapper’s trial on Wednesday as a defense witness told jurors about the homeless street preacher’s plans to impregnate her.

Smart, who has shown little emotion through weeks of sometimes graphic testimony, stood up and walked out after Utah state psychiatrist Paul Whitehead said a key motivation of Brian David Mitchell in raping her was so that she would bear his children.

Immediately before she abruptly left, Whitehead testified that Mitchell had told Smart, then 14, about his plans to impregnate her, and that the two had discussed baby names.

Smart, now 23, glared at the witness as she left, and followed about a minute later by her mother, Lois. Both women returned after a break.

When court was adjourned for the day Whitehead approached Smart, but walked away after she spoke sharply to him.

Mitchell returned to court on Wednesday after collapsing a day earlier from what defense attorneys said was a seizure, and being taken to a local hospital. The judge made no mention of Mitchell’s medical issues as court reconvened.

But his presence in court was short-lived as Mitchell, 57, was ejected by U.S. District Judge Dale Kimball for loudly singing Christmas carols.

Mitchell is charged with abducting Smart from her Salt Lake City home on June 5, 2002, and holding her captive for nine months with the intent of forcing her to live as his wife.

His estranged wife, Wanda Barzee, is serving a 15-year prison term for her role in the kidnapping and is cooperating with prosecutors.

Mitchell’s attorneys called Whitehead as a witness as part of an effort to prove the self-styled prophet should not be held criminally responsible for his actions because he is mentally ill.

Whitehead said he evaluated Mitchell over the course of about three years and came to the conclusion that he had a “major psychiatric illness” and “delusional disorder.”

The psychiatrist also disagreed with a characterization of Mitchell as deeply manipulative.

“I know he was seen as this master manipulator, I was not seeing that in reading the police reports,” he said.

Asked by a prosecutor, under cross-examination, to identify Mitchell’s chief delusion, Whitehead said: “He believes he is some sort of messenger between God and mankind.”

Smart has returned for the trial from the Mormon mission she is serving in Paris, and has listened to testimony from her seat in the courtroom gallery, surrounded by family members.

In dramatic testimony during the prosecution case, she recalled that Mitchell abducted her at knifepoint from the bed she shared with her sister, marched her several miles into the foothills above Salt Lake City and raped her.

She has described her time as Mitchell’s captive as “nine months of hell” in which she was raped nearly every day.

Smart was rescued in 2003 after she was spotted by passersby walking with Mitchell and his wife on a street in the Salt Lake City suburb of Sandy.