HOUSTON (AP) — A forensic psychiatrist was to testify for a third day in Andrea Yates' second murder trial.

Dr. Park Dietz, testifying for the prosecution during its rebuttal phase, was to take the stand again Monday. He evaluated Yates more than four months after she drowned her five children in the bathtub in 2001, and he has told jurors that she knew killing them was wrong.

Dietz testified Thursday and Friday, in which court was in session half a day.

Prosecutors were also expected Monday to call Dr. Michael Welner, a forensic psychiatrist who evaluated Yates in May.

After prosecutors rest their case, defense attorneys will call their rebuttal witnesses. Closing arguments were expected later this week.

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Dietz's testimony in Yates' first trial led an appeals court to overturn her 2002 murder conviction.

Dietz, also a consultant to "Law & Order," said an episode of the television series was about a woman being acquitted by reason of insanity after drowning her children in a tub. After Yates' conviction but before she was sentenced to life in prison, those involved in the case discovered no such episode existed.

The judge has barred attorneys from mentioning anything about that issue in this trial.

Yates, 42, charged in only three of the children's deaths, has again pleaded innocent by reason of insanity. She will be sentenced to life in prison if convicted.

Her attorneys say she suffered from severe postpartum psychosis and did not know that drowning 6-month-old Mary, 2-year-old Luke, 3-year-old Paul, 5-year-old John and 7-year-old Noah was wrong.

But prosecutors say Yates' actions belie those claims. She drowned the youngsters during the hour when she would be alone with them, after her husband went to work and before her mother-in-law arrived to help care for them. Then Yates called 911, and she later told a detective she killed them because she was a bad mother and wanted to be punished, according to testimony.