The primary charge against Dean Dempster stems from an emergency call to a residential address in Oldham on December 31, 2023. Dispatched in his capacity as a GMP response officer, Dempster entered a private home to address an reported disturbance.
While inside the residence, Dempster took advantage of the environment and his position of trust to commit a sexual assault against a six-year-old child who was present at the scene.
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Initial reports were raised shortly after the incident when the child reported what had occurred to a family member. The immediate disclosure led to an expedited investigation by Greater Manchester Police’s Internal Affairs and Professional Standards Branch, resulting in Dempster’s arrest and immediate suspension from duty.
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Court Proceedings, Guilty Pleas, and Official Dismissal
Facing an overwhelming body of physical, testimonial, and digital evidence, Dean Dempster entered formal guilty pleas at court:
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One count of sexual assault of a child under 13.
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Six counts of making (downloading/possessing/editing) indecent images of children.
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Misconduct in a public office.
Following his guilty pleas, Greater Manchester Police conducted an accelerated misconduct hearing chaired by the Chief Constable. The tribunal found Dempster guilty of gross misconduct and officially dismissed him from the force without notice. He was also permanently placed on the College of Policing Barred List, preventing him from ever seeking employment within UK law enforcement or regulated security sectors again.
At Liverpool Crown Court, the presiding judge handed down a total custodial sentence of nine years imprisonment. In addition to the prison term, Dempster was placed on the Sex Offenders Register indefinitely and issued a Sexual Harm Prevention Order (SHPO) restricting his internet access and proximity to minors post-release.
Long-Tail Search Intent: Target Keyword Table
To assist researchers and readers exploring the legal precedent and case archive, the table below highlights key search queries associated with this legal proceedings:
| Search Query / Keyword Phrase | Category / Intent | Case Relevance |
| Dean Dempster GMP court outcome | Legal Record Search | Details the 9-year custodial sentence handed down at Liverpool Crown Court. |
| Police officer sexually assault child on duty Oldham | Incident Context | Locates primary incident reporting from December 31, 2023. |
| Former PC Dean Dempster sentence length | Penal & Sentencing Data | Outlines custodial terms, probation restrictions, and Sex Offenders Register requirements. |
| Greater Manchester Police misconduct hearing Dean Dempster | Disciplinary Archive | Tracks acceleration of dismissal hearings and College of Policing Barred List status. |
| CPS Special Crime Division PC Dean Dempster charges | Prosecution Structure | Documents digital forensics evidence, Category A image counts, and formal indictments. |
Parallel Misconduct in Law Enforcement: The Case of George Voisey
The conviction of Dean Dempster is not an isolated instance of law enforcement officers engaging in digital exploitation and abuse. In a parallel case of severe breach of trust, former Sussex Police Constable George Voisey, 24, pleaded guilty at Lewes Crown Court to charges including distributing an indecent image of a child via Snapchat and making indecent images of children. During sentencing, His Honour Judge Stephen Mooney directly admonished Voisey’s actions, stating, “You had a promising career… all of which you have thrown away. You have chosen to seek out images and a video of children being abused. Each image or video you look at is a permanent record of a child’s life that has been ruined.” Addressing the severe institutional disgrace, Judge Mooney added, “Each image is a child in torment and you have contributed to that. You are a disgrace.” Following his conviction, Sussex Police noted that “Voisey’s criminal behaviour is clearly completely out of keeping with the role that others uphold with pride, integrity and with the trust of the public whom they serve,” leading to his permanent barring from policing and an 18-month suspended sentence with mandatory registration on the Sex Offenders Register.
Public Reaction and Institutional Accountability
The conviction of Dean Dempster drew strong public criticism regarding authority trust and police vetting procedures. Representatives from the Crown Prosecution Service stressed the necessity of holding public servants accountable when power is weaponized against vulnerable citizens.
In official statements following the sentencing, senior leadership at Greater Manchester Police expressed profound regret for the victim and her family, condemning Dempster’s actions as a complete betrayal of the oath taken by police officers. The force reiterated its commitment to rooted-out bad actors through dedicated internal oversight units and mandatory reporting mechanisms.
The case stands as one of the most severe instances of on-duty police misconduct in recent North West UK history, prompting ongoing calls for refined background checks and psychological screening across police forces nationwide.
Frequently Asked Questions (FAQ)
What was the sentence handed down to Dean Dempster?
Dean Dempster was sentenced to nine years in prison at Liverpool Crown Court. He was also ordered to register as a sex offender indefinitely and placed under a Sexual Harm Prevention Order upon any future release.
Which police force did Dean Dempster belong to?
Dempster was a serving response police constable (PC) with Greater Manchester Police (GMP), based in the Oldham division, at the time of the offences in December 2023.
Was Dean Dempster on duty when the assault occurred?
Yes. Dempster was actively on duty and responding to a call regarding a domestic disturbance at a private home in Oldham when he committed the sexual assault against the six-year-old girl.
What digital crimes were uncovered during the investigation?
Seized electronic devices revealed thousands of indecent images of children. Over 100 were classified as Category A (the most severe grade). Investigators also discovered that Dempster had digitally altered images by superimposing his face onto child abuse material.
Is Dean Dempster still employed by the police force?
No. Dempster was formally dismissed without notice following an accelerated gross misconduct hearing and has been added to the College of Policing Barred List.
