A Las Lomas resident has been handed a remaining prison sentence of just over nine years for the fatal knife killing of his pregnant mother, after the High Court approved a plea agreement that downgraded the original murder charge to manslaughter.
Michael Joseph, now 25 years old, received an initial sentence starting point of 27 years behind bars for the manslaughter conviction. This term was adjusted downward to account for mitigating circumstances, a sentencing discount for his early guilty plea, and credit for the more than six-and-a-half years he has already spent in remand detention. The adjustment left Joseph with nine years, one month, and 29 days remaining to serve.
The sentencing was delivered this Wednesday by Justice Sherene Murray-Bailey, who agreed that Joseph’s violent outburst was triggered by provocation tied to chronic psychological trauma he developed from childhood experiences.
The crime dates back to August 24, 2019, when Joseph was just 18 years old. On that day, he stabbed his 36-year-old mother Allistra Mack-Kampo to death inside the family’s Las Lomas home. At the time of her killing, Mack-Kampo was four months pregnant with another child.
The plea arrangement was negotiated between Joseph’s legal team from the Public Defenders’ Department and prosecution lawyers from the Office of the Director of Public Prosecutions. As part of the deal, Joseph entered a guilty plea to manslaughter, avoiding a full public trial for murder.
Outlining the court-agreed facts of the case, prosecutor Chenelle Moe explained that the brutal attack began shortly before 11 p.m. Joseph’s aunt, Rodha Mack, told investigating officers she was woken by loud screams and heard her sister (Mack-Kampo) yelling at her son to stop his assault.
When Mack rushed into the bedroom to intervene, she found Joseph wearing surgical gloves and stabbing Mack-Kampo repeatedly at the foot of the family bed. When Mack stepped in to stop him, Joseph turned his violence on her, leaving her with severe injuries including a fractured skull.
Joseph then turned on his five-year-old younger sister, grabbing her by the throat and dragging her into the home’s living room. The young girl managed to break free and escape outside, covered in her own blood. Relatives who had gathered at the scene alongside responding neighbours were able to restrain Joseph until local police officers arrived to take him into custody.
A post-mortem examination conducted after the killing confirmed that Mack-Kampo had sustained 41 separate stab wounds. Investigating officers recovered a broken knife and blood-stained surgical gloves from the crime scene.
During his initial police interview, Joseph openly admitted to carrying out the attack, explaining that a buildup of unresolved frustration had finally made him snap. He has since stated that he feels deep remorse for his actions and has asked his surviving family for forgiveness.
During sentencing arguments, defence attorney Michelle Ali and instructing attorney Sarah Julien argued that Joseph’s violent actions stemmed from severe childhood neglect, long-term emotional instability, and struggles with substance abuse. Court documents presented during the hearing detailed a troubled upbringing marked by constant family upheaval, rejection from caregivers, and early exposure to illicit drugs and alcohol.
Notably, even Rodha Mack — who was seriously injured in the attack — and Joseph’s grandfather Daniel Melville submitted formal written statements to the court saying they had forgiven Joseph, and urging Justice Murray-Bailey to prioritize rehabilitation over extended additional incarceration.
In her final sentencing ruling, Justice Murray-Bailey confirmed the court accepted the 27-year starting sentence for manslaughter, but applied significant reductions to account for mitigating factors, Joseph’s age at the time of the offense, his lack of any prior criminal convictions, and the mandatory one-third discount for his early guilty plea.
After subtracting the six years, eight months, and 27 days Joseph had already completed in pre-trial detention, the judge ordered the defendant to serve the remaining outstanding prison term.
She also issued a formal direction to prison authorities to place Joseph in targeted rehabilitative programming, including anger management courses, continuing education, and evidence-based substance abuse treatment. The judge further ordered that professional counselling services be provided to Joseph’s surviving family members, who have all been deeply affected by the tragedy.
Joseph also received convictions for the related offenses of wounding Rodha Mack with intent to cause harm and common assault against his younger sister, with the judge applying sentences of time served for these crimes.