The Silent Twins – Incarceration and Death of Jennifer Gibbons

On 9 March 1993, Jennifer Gibbons walked out of Broadmoor Hospital after eleven years of state-mandated antipsychotic injections. She was pronounced dead at 6:15 PM the same evening, aged 29. The official toxicology screen recorded no evidence of drugs in her system.

The Substitute Psychiatrist at Swansea Crown Court

In May 1982, June and Jennifer Gibbons stood in the dock at Swansea Crown Court facing charges of arson and burglary. They had set a £200,000 fire at a local tractor store and attempted a separate attack on Pembrokeshire Technical College. Both defendants were 19 years old and refused to speak.

The court needed to decide whether to send them through the criminal courts in the ordinary way or to divert them under the Mental Health Act 1959. To answer that question the judge needed a psychiatric assessment. Dr Spry, the psychiatrist assigned to the defence, was abroad.

In Dr Spry’s place the court heard from Dr John Hamilton, a consulting psychiatrist at Broadmoor. The judge put the statutory question to him: were the defendants suffering from a mental illness, psychopathic disorder, or subnormality of such a nature or degree as to warrant their detention in a hospital for medical treatment.

Hamilton answered yes.

Beyond that affirmative, he offered the court a description of Broadmoor that included a swimming pool. Journalistic accounts of the hearing record that this portrayal generated elaborate fantasies in the minds of the teenage defendants. On the strength of that single affirmative assessment, the judge ordered indefinite detention under the 1959 Act.

The original written report Dr Hamilton submitted to support that assessment is not in the public archive. No copy of the clinical justification for the ‘psychopathic disorder’ classification sits in the Ministry of Justice files. Nor does the verbatim sentencing transcript from Swansea Crown Court.

Eleven Years of Depixol at Broadmoor

Inside Broadmoor the twins were placed on a regime of first-generation antipsychotic injections. The named drug in the published medical record is Depixol, a long-acting injection in the thiozanthine family. These injections were intramuscular and designed to remain active in the muscle tissue for weeks at a time.

Jennifer developed tardive dyskinesia, a permanent nervous system disorder that produces involuntary, repetitive muscle movements. Her vision blurred and she struggled to concentrate. Tardive dyskinesia, once established, is generally irreversible.

Physical altercations between the twins forced the hospital to separate them onto different wards.

The original prescription and observation logs covering the eleven years of injections are sealed. Under the Data Protection Act 2018, access to Broadmoor patient files is restricted to approved clinical researchers on a case-by-case basis. No member of the public can audit the exact dosage, frequency, or brand administered to Jennifer Gibbons between 1982 and 1993.

The Morning of 9 March 1993

The day before the transfer, Jennifer’s speech became slurred. Hospital clinical logs note a mild flu-like illness. June, her sister, later said Jennifer complained of feeling generally unwell.

On the morning of 9 March 1993, the twins left Broadmoor in a transport vehicle bound for the Caswell Clinic at Glanrhyd Hospital in Bridgend, Wales. Within ten minutes of the gates closing behind them, Jennifer’s physical state deteriorated rapidly. She slumped onto her sister’s shoulder during the journey.

According to a published account of the transfer, she said to June: ‘At long last, we’re out’.

At the Caswell Clinic she could not be roused. Transport staff and the receiving medical team moved her on to the local general hospital.

At 6:15 PM that evening Jennifer Gibbons was pronounced dead aged 29.

The toxicology screen drawn from her body would later record no evidence of drugs.

The Inquest’s Two Contradictions

An inquest was held at Bridgend in late 1993. Coroners enquire into any unexpected death, and the death of a young woman in transfer between two state hospitals fell squarely inside that remit. The pathologist called to give evidence was a senior lecturer in forensic pathology.

He reported finding two physical conditions: red blood cells being destroyed faster than her body could produce them, and massive sudden death of all the heart muscle tissue. That destruction had only been active for a few hours prior to her death. The pathologist confirmed the timing on the record.

He went on to note that this type of catastrophic heart failure is most commonly seen in young adult men who collapse while undertaking strenuous physical exercise. Jennifer Gibbons was a heavily sedated 29-year-old woman who had spent the preceding hours sitting stationary in a vehicle.

The wrinkle came next.

In the tissue sample, the pathologist noted that several different types of immune cell had crowded into the dead area, not the single type that physically marks a standard viral infection. Asked by the court whether he could rule out an adverse drug reaction, he said he could not.

The official toxicology screen presented to the court reported no evidence of drugs or poison in her system.

Reviewing the evidence, the coroner told the jury what verdicts they could return. A finding of ‘misadventure’ was available if they believed the death was the direct result of an abnormal, acute reaction to her drugs. The alternative on offer was ‘natural causes’, if they believed she died of a sudden virus.

With those two options on offer, the jury returned natural causes and added no rider for negligence.

Dr Alexander Kellam, a consultant forensic psychiatrist, published a note in the Psychiatric Bulletin shortly after the inquest. Depixol is a thiozanthine, but a thiozanthine closely related to phenothiazines. Cardiac pathology textbooks, Kellam pointed out, list phenothiazines as a possible cause of toxic necrosis of the heart muscle.

The raw laboratory data behind the toxicology screen sits in the closed inquest file. Whether the laboratory tested liver and muscle tissue for long-acting depot traces of Depixol, or only ran a standard blood screen designed for recreational narcotics, is not on the public record.

The Sealed Archive

Three sets of documents would settle the questions left open by the inquest. None are currently in the public domain.

The 1982 Swansea Crown Court sentencing transcript and Dr John Hamilton’s original written assessment are missing from the Ministry of Justice archive. Broadmoor’s prescription and observation logs covering 1982 to 1993 are sealed under the Data Protection Act 2018, with access restricted to approved clinical researchers. As for the 1993 inquest case file, it is closed under Section 9 of the Public Records Act 1973, and will not automatically enter the open public domain until 2068.

Familial access before that date requires direct relation and the coroner’s express permission.

No public document confirms that the Bridgend forensic pathologist had Jennifer’s eleven-year Broadmoor medical file in hand when conducting the post-mortem. Without that confirmation, the most basic question about the autopsy stays open: whether the doctor who examined the heart knew about the drugs that had been delivered into the muscle for eleven years.

Source

Sources include: case reports from the ‘Journal of the American Academy of Psychiatry and the Law’ (2024); published inquest pathology notes and consultant correspondence from the ‘Psychiatric Bulletin’ (1993); contemporary journalistic accounts from ‘The Guardian’ (2003); coronial process guidelines from the Gloucestershire Archives and Worcestershire Archive; and statutory closure frameworks defined by the Data Protection Act 2018 and the Public Records Act 1973.