The murder trial of teacher Jamie Varley at Preston Crown Court has become a significant example of the influence expert witness evidence can exert in complex child death prosecutions. The prosecution alleges that Varley murdered 13-month-old Preston Davey, a child he was in the process of adopting with his partner, John McGowan-Fazakerley.
Varley faces allegations including murder, manslaughter, causing grievous bodily harm, sexual assault, child cruelty, and indecent image offences. McGowan-Fazakerley denies charges of causing or allowing the death of a child, sexual assault, and cruelty.
The defence contends that the prosecution case is largely circumstantial and has been substantially weakened by competing expert opinions. Central to the dispute are differing interpretations of pathological findings, the cause of Preston's death, evidence of alleged sexual abuse, and the significance of various injuries identified during post-mortem examinations.
At the heart of the trial lies a familiar forensic question: where respected experts disagree, can a jury be sure of guilt beyond reasonable doubt?
A Case Built on Competing Scientific Theories
The prosecution's case against Jamie Varley has been described by the defence as one that depends heavily upon inference rather than direct evidence.
Addressing jurors at Preston Crown Court, Nicholas Johnson KC argued that the Crown's allegations rely upon a chain of circumstantial evidence which has been significantly undermined by alternative expert analysis.
The defence submission raises a fundamental issue frequently encountered in criminal proceedings involving infant deaths: whether medical findings are capable of more than one credible explanation.
According to Mr Johnson, the prosecution's interpretation of the medical evidence is far from conclusive and should not be accepted simply because it is one possible explanation.
He reminded jurors that an earlier provisional finding recorded Preston Davey's cause of death as "unascertained", a conclusion that sits uneasily alongside allegations of deliberate homicide.
The Pathology Evidence
A central figure in the prosecution case is Dr Alison Armour, a Consultant Forensic Pathologist, whose evidence suggested that Preston's airways had been obstructed by an object placed into his mouth.
Dr Armour's opinion was that the child suffered airway obstruction consistent with smothering and that bruising identified within the throat structures supported that conclusion.
The prosecution relies heavily upon her assessment that the injuries were indicative of inflicted harm rather than accidental causes.
However, the defence challenged those conclusions vigorously. According to Mr Johnson KC, the pathological findings are capable of alternative explanations. The defence argued that bruising within the throat may have been caused inadvertently during emergency medical intervention, particularly during attempts to intubate the child using a laryngoscope.
The court heard that whilst such an occurrence might be uncommon, it remains a recognised risk associated with resuscitation procedures. The defence submission was not that Dr Armour's conclusions were impossible, but rather that they represented one interpretation among several plausible explanations.
Alternative Expert Opinion
The defence relies significantly upon the evidence of Professor Jack Crane, a highly respected Forensic Pathologist and former State Pathologist for Northern Ireland. Professor Crane accepted that aspects of Dr Armour's theories were possible. However, he reportedly disagreed with the degree of certainty attached to those conclusions. In relation to the throat injuries, Professor Crane's opinion was that the bruising would be more consistent with trauma caused by a sharp object than by the mechanism advanced by the prosecution.
This distinction is potentially important because it introduces an alternative explanation inconsistent with the Crown's theory of deliberate airway obstruction.
The defence characterised Professor Crane's evidence as substantially weakening the prosecution's case by demonstrating that the pathological findings are not exclusive to one interpretation. As is often the case in complex forensic litigation, the disagreement between two eminent pathologists highlights the difficulties juries face when navigating highly technical scientific evidence.
Gastro-Oesophageal Reflux and Alternative Causes of Death
Perhaps the most significant area of dispute concerns the ultimate cause of Preston's death.
The defence presented an alternative medical theory based upon Preston's documented history of gastro-oesophageal reflux. Medical records revealed that the child had been diagnosed with the condition before being placed with the prospective adoptive parents.
Evidence was presented that Preston had been unwell on the day of his death and that vomitus was identified within his lungs. According to the defence, Preston may have suffered a seizure or acute airway obstruction resulting from aspiration associated with reflux disease. Professor Crane's analysis was said to support the proposition that such a mechanism could explain the medical findings without involving sexual abuse or homicide.
Mr Johnson argued that this represented a credible alternative explanation capable of generating reasonable doubt. The defence further pointed to an earlier medical episode on 15 June 2023, during which Preston reportedly suffered another unexplained collapse. While the prosecution suggested the common denominator was Jamie Varley's presence, the defence countered that gastro-oesophageal reflux represented an equally significant common factor.
Disputed Injury Findings
The defence also challenged the interpretation of a number of other injuries identified during the investigation.
Pelvic abnormalities relied upon by the prosecution were said to be capable of innocent explanation. Jurors heard that tissue preparation and slide-cutting processes used in histological examination can occasionally produce artefacts that resemble injury. Similarly, constipation was advanced as a potential explanation for some of the pelvic findings.
The court also heard evidence concerning bruising to Preston's bladder. Rather than indicating deliberate injury, the defence argued that the bruising may have been caused during frantic resuscitation attempts undertaken by Varley as he tried to revive the child. Such disputes are not unusual in paediatric forensic pathology, where determining whether a finding represents injury, artefact or post-mortem change can become a matter of significant expert disagreement.
Allegations of Sexual Abuse
The prosecution also alleges sexual abuse of Preston. However, the defence argued that scientific evidence supporting those allegations remains inconclusive. DNA evidence recovered from around Preston's cot was described as incapable of proving the alleged offences.
The defence also challenged interpretations of bruising identified on the child. Jurors were told that one expert witness considered certain linear bruises to be more consistent with gripping than slapping. The significance of that distinction lies in whether the injuries are indicative of abuse or capable of arising during ordinary childcare activities. Mr Johnson further criticised reliance upon assumptions unsupported by objective forensic findings, reminding jurors that criminal convictions must be based upon evidence rather than suspicion.
The prosecution's pathology evidence led by Dr Alison Armour maintained:
• Preston's death was caused by acute upper airway obstruction;
• Drowning was ruled out;
• Approximately 40 external and internal injuries were identified; and certain injuries were considered consistent with sexual abuse.
The defence challenged those conclusions through the evidence of Professor Jack Crane.
Professor Crane did not necessarily dispute every finding made by Dr Armour, but he reportedly offered alternative interpretations of several injuries and questioned whether the pathological evidence supported the prosecution's conclusions to the degree alleged. The defence argued that some findings could be explained by medical intervention, gastro-oesophageal reflux, resuscitation attempts, or other non-criminal causes
The Case Against the Co-Accused
Representing co-defendant John McGowan-Fazakerley, Anne Whyte KC argued that there was no evidence he had witnessed any abuse.
She emphasised that many of the most serious allegations concerned periods when her client was not present. The court heard that McGowan-Fazakerley was absent during several key incidents relied upon by the prosecution and was not present when certain allegedly indecent images and videos were created. Ms Whyte argued that the prosecution's case against her client was fundamentally different from those cases in which a partner knowingly ignores obvious and escalating abuse. Instead, she submitted that McGowan-Fazakerley had no knowledge of any alleged offending and believed he was building a stable family life with both Preston and Varley.
Lessons for Criminal Practitioners
The competing opinions of Dr Alison Armour, Consultant Forensic Pathologist, and Professor Jack Crane, Forensic Pathologist and former State Pathologist for Northern Ireland, emerged as pivotal issues for the jury. The case serves as a reminder that expert evidence rarely operates in isolation. Rather, it must be evaluated alongside the wider factual matrix, witness testimony, contemporaneous records and circumstantial evidence.
Where distinguished experts reach different conclusions from the same medical findings, the burden remains upon the prosecution to satisfy a jury so that it is sure of guilt. As the trial continues, the jury's assessment of these competing expert opinions may ultimately determine whether the Crown has discharged that burden.
Update: The teacher has been found guilty of sexually abusing and murdering the 13-month-old baby boy he adopted with his partner. He will be sentenced on Thursday 18th of June.
By Edward Price
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