Most of what the public knows about Jeffrey Dahmer’s psychiatric history comes filtered through trial testimony, journalism, and decades of secondhand retelling. It is rare to encounter the underlying clinical paperwork itself — the actual document a forensic evaluator typed up in the weeks before his trial, before any of it had been summarised, dramatised, or simplified for a courtroom or a headline.
The memorial has obtained a copy of one such document: Jeffrey Dahmer’s competency evaluation, Case No. F-912542, dated April 27, 1992. It was prepared ahead of his trial to assess his fitness to stand trial and his sanity at the time of the offences. It is dense, clinical, and unglamorous — exactly what a real psychiatric record looks like, as opposed to how one gets portrayed on screen.
We are publishing what it contains, and being transparent about what it changed in our own previous reporting.
What the Document Shows
The evaluation is thorough. It draws on interviews, a review of police and medical examiner records, and a substantial body of testing — some of it newly administered, some of it years old.
Neurological testing. The document states plainly that Jeffrey underwent an electroencephalogram (EEG), a CAT scan of the brain, and a chromosomal analysis. All three were reported as negative for pathology. No structural abnormality. No seizure activity. No chromosomal anomaly.
Psychological testing, across years. The evaluator references a substantial battery: the Wechsler Adult Intelligence Scale (Revised), the Rorschach, and the Minnesota Multiphasic Personality Inventory. The MMPI had first been administered in 1986, then again twice in 1989, while Jeffrey was on probation — years before the murders that led to his arrest came to light. It was administered again across several dates in late 1991 and early 1992, following his arrest. The evaluator notes that the 1986 and 1989 profiles point to a personality disorder with symptoms of anxiety and depression, while the 1991 and 1992 profiles — taken after a substantial period of incarceration — show a worsening of adjustment and greater intrapsychic discomfort. The three profiles together were strongly associated, in the evaluator’s words, with acting-out behaviour and a negative therapeutic prognosis.
A documented mental health history that begins with absence. The evaluation states clearly that Jeffrey had never received treatment in a psychiatric hospital, and had not received counselling as a child or adolescent — despite a reportedly family history of emotional difficulties and substance abuse. The clinical record of his interior life, in other words, effectively begins in adulthood, after most of the damage had already been done.
Outpatient therapy he resisted. As an adult, Jeffrey was ordered by the court into outpatient therapy with a Milwaukee psychologist, Dr. Evelyn Rosen. He did not participate voluntarily, and resisted her attempts to work with him. He was also referred to the DePaul outpatient alcohol treatment programme following his discharge from a work release programme, and began seeing a Dr. William Crowley roughly one month before his arrest in July 1991 — though he later said he could not be open in that therapeutic context because of the criminal nature of the behaviour he was engaged in. He was, in effect, in treatment while still actively killing, and unable to say so.
What was happening to him at the moment of evaluation. By April 1992, Jeffrey was being seen approximately three times a week by Dr. Patricia Allen, the clinical psychologist at Columbia Correctional Institution. She reported that he was being treated for anxiety and depression, housed in a restricted unit while being oriented to the prison setting. He had been prescribed Prozac — two 20mg capsules in the morning — by his treating psychiatrist, Dr. Richard Arnesen. Dr. Allen noted he seemed to be experiencing less severe bouts of depression at that time, though she did not consider him imminently suicidal.
The document also notes that Jeffrey reported being subject to both taunting and threats from fellow prisoners during this period, and that he had become, in his own word, “paranoid” — while acknowledging there was a realistic basis for that fear.
What This Document Corrected
When we first wrote about Jeffrey’s psychiatric history on this memorial, we made a factual error. We claimed that no neurological examination — no CAT scan, no MRI, no EEG — was ever performed on him, and that the question of a biological origin for his trance states and compulsive behaviour was never seriously pursued.
That claim was wrong, and this document is why we know it.
We have gone back and corrected both articles affected by this discovery. In “A Mind in Pieces: The Psychiatric Diagnoses of Jeffrey Dahmer,” the Trance States section and the closing “Final Note” have both been revised to reflect what this document shows: that an EEG and CAT scan were in fact performed, ahead of his trial in 1992, and came back negative. We have left the original error visible rather than quietly editing it away, because the memorial believes that transparent correction is part of doing this work honestly.
This finding also bears on “The Mind That Wouldn’t Stay: Jeffrey Dahmer’s Dissociative Episodes and What They Tell Us,” which explores the trance states and dissociative patterns documented throughout his life. A negative EEG and CAT scan do not rule out every possible neurological contribution — these are blunt instruments, especially when not administered during an active episode — but they meaningfully narrow the most obvious structural explanations. The evidence points more strongly toward the psychological and developmental account that article lays out, rather than an undetected physical abnormality.
Why This Matters
A 34-year-old clinical document might seem like a small thing to build an article around. We think it matters for a specific reason: it is a piece of Jeffrey Dahmer as he actually was on paper in April 1992, not as he has been since reconstructed, dramatised, or argued over. It shows a man who had been formally tested and found neurologically unremarkable, who had a documented history of resisting help when help was offered, who was, at the exact moment of evaluation, on antidepressants, in a restricted unit, frightened of the other men around him, and being seen three times a week by a psychologist who did not think he was about to die by his own hand.
None of this changes what he did. It does change what the historical record actually says — and getting that record right, including correcting our own mistakes within it, is the whole basis on which this memorial asks to be trusted.
Primary source: Jeffrey L. Dahmer, Competency Evaluation, Case No. F-912542, April 27, 1992.
Jeffrey Dahmer Memorial 