top of page

Battle of the Experts: Dietz vs. Resnick on the Insanity of Andrea Yates

Andrea Yates in court on Expert Psychological Evaluations article on Insanity authored by Benjamin Silber, Ph.D.
Andrea Yates in Court


In 2001, the nation was captivated by the highly-publicized Andrea Yates trial. Yates, a Texas mother, was accused of killing her five children by drowning them. Beyond the case's inherent tragedy, complex problems with mental health, postpartum depression, psychosis, and the application of the insanity defense captured the attention of the public. Drs. Park Dietz and Phillip Resnick, two renowned forensic psychiatrists, emerged as significant witnesses during the trial and provided contrasting expert judgments.

Park Dietz and the Prosecution

The prosecution's case against Andrea Yates was aided by Dr. Park Dietz, a prominent forensic psychiatrist noted for his rigorous approach to his evaluations for the insanity defense. Dietz, who has provided expert opinions in numerous high-profile cases, argued vehemently that Yates was capable of moral judgment at the time she drowned her children despite having a major mental disorder. Texas law uses this discernment—or lack thereof—as a key condition for rejecting the insanity defense.

Dietz's argument focused heavily on Yates' actions after the incident. Yates immediately called 911 and her husband to confess to her actions after drowning her children. She also claimed that Satan's influence had a role in her choice to murder her children. According to Dietz, these deeds and remarks demonstrated that she was aware of the impropriety of her behavior, fulfilling the legal standards for criminal responsibility in Texas. He incorrectly claimed throughout the trial that Yates had been influenced by a "Law & Order" episode in which a lady was exonerated after drowning her children and successfully arguing insanity.

In an article authored by Dr. Resnick in 2007, he summarized Dr. Dietz's arguments as follows:

  1. Mrs. Yates believed that it was Satan who put the thought in her mind to drown the children and encouraged her to do so.

  2. Mrs. Yates made the decision to conceal from everyone her beliefs about Satan’s presence and influence, her thoughts of harming the children, and her plan to drown the children.

  3. Mrs. Yates believed that killing the children would be sinful.

  4. Mrs. Yates knew at the time she killed the children that society would judge her actions as “bad.”

  5. Mrs. Yates knew at the time she killed the children that God would judge her actions as “bad.”

Controversy Surrounding Dietz's Testimony

Dr. Park Dietz's testimony in the Andrea Yates trial gave rise to a significant debate. Dietz testified at the trial that Yates had been influenced by a "Law & Order" episode in which a mother drowned her kids and successfully argued that she was insane in order to avoid punishment. This significant testimony sought to prove Yates had a calculated plan to escape punishment.

Later on, it was found that no such "Law & Order" episode had aired. The credibility of Dietz's evidence was severely harmed by this factual error, which ultimately resulted in a retrial. The incident brought attention to how crucial accuracy is in expert testimony and spurred heated discussions regarding the role and accountability of expert witnesses in court proceedings.

Yates family gravestone on Expert Psychological Evaluations article on Insanity authored by Benjamin Silber, Ph.D.
Yates Gravestone

Phillip Resnick and the Defense

Another skilled forensic psychiatrist, Dr. Phillip Resnick, became a key player for the defense during the Andrea Yates trial. Resnick, who has done substantial research on filicide, offered a viewpoint that was radically different from Dietz's, highlighting the significant influence Yates' mental illness had on her actions.

Yates, according to Resnick, had postpartum psychosis, a serious mental illness that affected her decision-making and sense of reality at the time of the offenses. He emphasized Yates' severe delusions and hallucinations, which led her to believe she was acting in her children's best interests.

Resnick specifically referred to Yates's conviction that by killing her children, she was rescuing them from an eternity in hell. Resnick maintained that despite how painful and disturbed this notion was, it was a crucial sign of her damaged mental health. He believed this demonstrated Yates' inability to truly recognize the wrongness of her acts because she was deluded by her illness into thinking she was acting morally.

In his 2007 article, Dr. Resnick summarized the primary five points that he based his opinion on as follows:

  1. Mrs. Yates believed it was right to drown her children because she held a delusional belief that her children were not being raised “righteously” and that they would “burn in hell” if she did not take their lives. She faced a psychotic dilemma. She thought that she was doing what was right for her children by arranging for them to go to heaven while they were still “innocent.” She stated, “They had to die to be saved.”

  2. Mrs. Yates loved her children so much that she was not deterred from “saving her children’s souls” by the fact that she expected to be executed by the state of Texas. She believed that because the one and only Satan was within her, that Satan would be executed along with her.

  3. Mrs. Yates did not kill her children in 1999 in spite of command hallucinations to do so because she believed it was not in her children’s best interest to die at that time. When she heard the “voice of Satan” instructing her to stab her children in 1999, she, instead, twice attempted suicide rather than risk harming her children. It was only when her psychosis recurred in 2001 that she came to delusionally believe that it was in her children’s best interest to die. Only then did she take their lives “to save their souls.”

  4. Mrs. Yates made no effort to hide her crime. Her delusional belief that TV cameras were monitoring her did not stop her from killing her children in her home. Immediately after the killings, she called the police, remained at the crime scene, and requested to be punished.

  5. Mrs. Yates had no alternative motive to take the lives of her children other than the psychotic belief that she was saving their souls. She was a devoted mother. She stated in her audiotaped confession on June 20, 2001, that her children were not developing correctly. She added that she was not mad at her children because they had not done anything wrong.

Resnick's expert testimony gave the jury a sobering view of the crippling consequences of postpartum psychosis and a more expansive interpretation of the insanity defense, accounting for both the capacity to distinguish between right and wrong and the degree to which severe mental illness can distort that capacity. He provided a dramatic contrast to Dietz's testimony, fueling ongoing discussions about how the legal system handles cases with serious mental diseases.

The Clash of Perspectives

The conflict that exists at the nexus of psychiatry and law is vividly illustrated by the opposing arguments made by Drs. Park Dietz and Phillip Resnick in the Andrea Yates case, especially when it comes to construing and applying the insanity defense.

Dr. Dietz's prosecution testimony heavily leaned on a more conventional and formal definition of insanity: the capacity for moral judgment (or lack thereof). His focus on Yates' actions and statements after the crime suggested that she was guilty of the crime because, although having a mental illness, she still comprehended the moral and legal ramifications of her acts.

In stark contrast, Dr. Resnick's viewpoint—presented for the defense—placed more emphasis on the overall effects of serious mental illness than it did on the dichotomy of good and evil. He claimed that Yates truly believed she was acting in the best interests of her children since her postpartum psychosis had so severely warped her understanding of reality and morality.

These divergent points of view created the conditions for a contentious legal dispute that went beyond the parties concerned and into the area of psychiatric legal theory. The case served as a reminder of the ongoing challenges and concerns surrounding the insanity defense as well as the larger fight to accommodate complex notions of mental illness into a legal system that is frequently preoccupied with more binary notions of guilt and innocence.

The crucial necessity for the judicial system to continue grappling with and comprehending the complexity of mental health, especially in situations involving the insanity defense, was highlighted by this battle of the experts. Discussions on these topics are still shaped by the trial's history.


In conclusion, the battle of the experts during the Andrea Yates trial, symbolized by the opposing perspectives of Dr. Park Dietz and Dr. Phillip Resnick, highlighted the complex relationship between mental health and the law, especially in the use of the insanity defense. This case serves as a reminder of the ongoing need for a nuanced understanding and application of mental health within the justice system, and discussions of the relationship between psychiatry and the law continue to be informed by it. As a result, efforts to deal with cases involving severe mental illness are being pushed forward in a more sympathetic and effective way.


Resnick, P. J. (2007). The Andrea Yates case: Insanity on trial. Cleveland State Law Review, 55(2), pages 146-156.

Authored by

Benjamin Silber, Ph.D., ABPP, Forensic Psychologist, and Savera Mushtaq
Benjamin Silber, Ph.D., ABPP, Forensic Psychologist, and Savera Mushtaq


Bigbrinjal Online Medicine Store is your one-stop destination for buying ED medicines at discounted prices. We offer a wide range of generic Viagra and Cialis pills for both men and women. In addition, we also provide Careprost eyedrops that help in growing eyelashes and other eyecare products containing Bimatoprost. Our store also offers antiviral medications such as Ivermectin 12mg. You can conveniently shop for all your necessary medications from the comfort of your home.  Address: 4339 Monroe Street, Texas - 77055 USA <a href="">Bigbrinjal online medicine store</a>


buy oxycodone online in usa

Oxycodone is a potent opioid analgesic, commonly prescribed to manage moderate to severe pain. It belongs to the class of medications known as opioid agonists, and it works by binding to specific receptors in the brain and spinal cord, reducing the perception of pain. Oxycodone is often used in various formulations, including immediate-release and extended-release forms. While effective in relieving pain, oxycodone carries a risk of dependence and addiction, and its misuse can lead to serious health consequences. Due to its potential for abuse, healthcare providers carefully assess patients before prescribing oxycodone and monitor its use closely. Common side effects include drowsiness, constipation, and nausea. It is crucial for individuals taking oxycodone to follow their…


Plastic Surgery in Miami

Dr. Anne-Sophie Lessard, is a double board-certified top rated plastic surgeon in Miami, FL. She has been practicing for over 10 years. She trained at the prestigious McGill University in Plastic and Reconstructive Surgery and pursued a postdoctoral fellowship at the Jackson Memorial Hospital. Afterwards, she worked at the University of Miami’s Miller School of Medicine for 3 years in the Division of Plastic Surgery, where she taught plastic surgery. She is a leading expert in breast and body contouring surgeries such as breast augmentation, breast implant removal, breast reduction, tummy tuck, mommy makeover and labiaplasty. Dr. Lessard is also an avid scholar with extensive national and international publications in leading medical journals that push the…


Noah James
Noah James
Dec 28, 2023

The clash of perspectives between experts Dr. Park Dietz and Dr. Phillip Resnick in the context of the Andrea Yates case, famously known for its tragic outcome, adds a layer of complexity to the debate surrounding mental health and legal accountability. Much like the divergence in opinions, seeking assistance in academic endeavors through services like take my online course for me introduces an element of choice and expertise. Dr. Dietz argued that Yates was legally sane, emphasizing premeditation, while Dr. Resnick contended that she was legally insane, citing severe postpartum psychosis.


Seo Work
Seo Work
Nov 02, 2023
bottom of page