Five mental health experts testified that Yates did not know right from wrong or that she thought drowning her children was right. Dietz was the only mental health expert to testify for the prosecution and the only one who testified she knew right from wrong.
While prosecutors agreed Yates was mentally ill, they argued that the illness was not severe enough to impede her ability to know right from wrong. Jurors agreed, and did not declare her legally insane.
Yates, 41, was sentenced to life in prison and is jailed at a psychiatric prison in East Texas.
In spite of the unlikelihood of a plea deal — in which Yates would plead guilty to the killings rather than not guilty by reason of insanity — there is one scenario that both the defense and the prosecution could agree to.
"The government would have to give up the ghost on seeking the death penalty, the sentence being life in an institution instead of in jail [with the rest of the prison population] without the possibility of parole," FOX News senior judicial analyst Judge Andrew Napolitano told FOXNews.com. "That's the only guilty plea that would be acceptable."
Yates isn't currently housed with the general inmate population, and Napolitano said both sides would have to concur that she should spend the rest of her life in either a mental institution or a psychiatric prison without the chance of ever going free.
"The jury found that she is not a danger to anybody else, that she’s so crazy she couldn’t hurt a fly in jail," Napolitano told FOXNews.com.
But Texas prosecutors are elected, meaning they have to answer to voters.
"It's a rough-and-tumble, swaggering electorate who like to see the guilty punished to the max," Napolitano said. "I don't know that a plea deal is in the cards. It depends on the political wishes of the prosecutor."
The murders of the Yates children, the youngest a 6-month-old baby and the oldest a 7-year-old, horrified the country and became a high-profile instance of postpartum depression used in an insanity defense.
Yates' name has been frequently evoked in similar cases, most recently last month when a young mother dropped her three young children to their deaths in the San Francisco Bay.
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