Pensioner Convicted for Rape and Murder 46 Years On
Dennis McGrory, 75, from Milton Keynes, has finally been found guilty of the brutal 1975 rape and murder of 15-year-old Jackie Montgomery in Islington. The Huntingdon Crown Court jury gave their verdict on Monday, 19 December. McGrory will be sentenced on Friday, 13 January.
DNA Breakthrough Cracks Cold Case
McGrory was initially acquitted 46 years ago after a judge’s ruling, but a painstaking review of the case by the Met’s detectives and forensic scientists changed everything. New DNA analysis revealed that the genetic material found on Jackie was a billion times more likely to belong to McGrory than anyone else.
This powerful evidence led the Court of Appeal to quash the original verdict and order a retrial under the double jeopardy law, which allows a convicted individual to be tried again if compelling new evidence surfaces.
Detectives Praise Modern Forensics and Tenacity
Detective Constable Jane Mascall: “In 1975, DNA testing didn’t exist, so the original investigation relied on traditional evidence, leading to McGrory’s acquittal. Thanks to advances in forensic science, we found his DNA on a swab from Jackie. This evidence was crucial to reopening the case and making sure he faced justice. Jackie’s sister Kathy was determined this case wouldn’t be forgotten. We hope this verdict brings some comfort to the family.”
Detective Superintendent Rebecca Reeves: “McGrory’s conviction after so many years shows the lengths police will go to secure justice. He was a violent man who terrorised the women around him. Thanks to diligent detectives and forensic experts, he’s finally been held accountable for a young girl’s tragic death. Jackie was a bright, courageous teenager who stood up for her aunt against violence. Our thoughts remain with the family. This case highlights the relentless work of specialist teams bringing cold cases to justice with cutting-edge forensic evidence.”
Justice for Jackie: Family Speak Out
Jackie’s sister Kathy said, “Jackie and I always said we could trust no-one. A violent man who lived in our family raped and murdered my sister. He spent nearly 50 years free while Jackie didn’t even reach 16. This has caused so much trauma, but we are finally relieved to get justice.”
Jackie’s horrifying murder involved stabbing, strangulation with an iron flex, blunt force injuries, and sexual assault in their Islington home. The disturbed phone off the hook told a silent plea for help.
Cold Case Reopened After Family Plea
The Met’s Specialist Casework Team reopened Jackie’s case in 2015 following the family’s appeal for answers. A re-examined body swab confirmed McGrory’s DNA. He was re-arrested in 2020 and charged again, 45 years after Jackie’s murder.
McGrory, 28 at the time, had sought Jackie’s aunt who had fled his violent abuse. Instead, his rage fell on Jackie, who was home alone. Before the attack, McGrory had been drinking heavily and later tried to mislead neighbours with a torn piece of Jackie’s diary he claimed was an address note.
The trial also revealed McGrory had previously threatened Jackie with sexual violence, deepening the darkness of this long-unsolved crime.
This case sends a strong message: time won’t protect violent offenders. Modern forensic science and relentless policing ensure justice – no matter how long it takes.
