The shocking double murder of Albert Alfonso and Paul Longworth at their home in Shepherd’s Bush, West London, sent shockwaves through the nation when the gruesome details emerged in court. The trial of 35-year-old Yostin Andres Mosquera revealed a horrifying tale of premeditated violence, psychological manipulation, and an attempted cover-up so chilling it will remain etched in public memory for years to come. The civil partners, who lived together peacefully for years, fell victim to a man they had welcomed into their home—a man they trusted.
What unfolded next was a calculated and cold-blooded plan to kill, dismember, and dispose of their bodies, culminating in Mosquera transporting their remains in suitcases to Clifton Suspension Bridge in Bristol. The case not only horrified the courtroom but also demanded a sensitive and thorough investigation involving multiple police forces and support from the LGBT+ Independent Advisory Group.
A Chilling and Calculated Double Homicide
On July 8, 2023, Yostin Andres Mosquera launched a brutal attack on the couple inside their flat in Scotts Road. The killings were anything but spontaneous, as shown by Mosquera’s disturbing internet search history and pre-planned actions. Jurors at Woolwich Crown Court heard that Mr. Alfonso was the first to be killed—stabbed repeatedly in the face, torso, and neck during a sex session that was filmed by Mosquera himself.
In a display of twisted cruelty, he was heard on camera taunting the dying man, even singing and dancing afterward. The court was shown this footage, and the judge later acknowledged how distressing and traumatic it must have been for the jurors.
Mr. Longworth was murdered in a similarly brutal fashion. He was struck at the back of the head with a hammer—his skull shattered by the force of the blow. Mosquera, who had previously lived with the couple, reportedly targeted Mr. Longworth next, having planned the sequence of killings. The prosecution proved that Alfonso was at work at the time of Longworth’s death, directly contradicting Mosquera’s defense that Alfonso had murdered Longworth.
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In one of the most disturbing revelations during the trial, Mosquera had searched the internet for phrases like “where on the head is a knock fatal?” and “hammer killer” in the days leading up to the murders. This digital trail destroyed his defense of manslaughter through loss of control. He had also been searching for chest freezers, asking questions in Spanish and using Google Translate, clearly attempting to find a way to preserve the bodies after the killings.
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After the murders, Yostin Andres Mosquera decapitated and dismembered the bodies. Parts of their remains were stored in a freezer, while others were placed in suitcases. On July 10, two days after the killings, Mosquera transported the suitcases containing the body parts to Clifton Suspension Bridge in Bristol. His intention, prosecutors argued, was to throw the remains over the edge. Fortunately, he was stopped before this could happen.
Manipulation, Cover-up, and Financial Motive
Yostin Andres Mosquera’s behavior in the aftermath of the murders painted a disturbing picture of a man who was cold, calculating, and manipulative. After killing the couple, he did not panic or try to hide in fear—he attempted to exploit his victims even in death.
He accessed their online banking information using a spreadsheet that contained their passwords and attempted to transfer £4,000 to his bank account in Colombia. The prosecution also highlighted how Mosquera had previously tried to open a bank account using the couple’s address. These actions point to financial motive behind the killings.
When he was spotted by a cyclist on the Clifton Suspension Bridge with a large red suitcase and a silver trunk, Mosquera claimed they contained car parts. However, bridge staff noticed a liquid leaking from one of the bags. When questioned, Mosquera fled the scene. He was arrested shortly after, thanks to a coordinated effort between the Metropolitan Police and Avon and Somerset Police.
Yostin Andres Mosquera, a Colombian national who did not speak English fluently, claimed during the trial that he had acted out of fear. He alleged that he had been threatened by Mr. Alfonso and that he believed his life was in danger. He further claimed that he thought Alfonso had already killed Longworth and that he was next. His defense counsel tried to explain his strange post-murder behavior—singing and dancing—by suggesting that he had been overwhelmed emotionally.
However, the jury was not convinced. The overwhelming forensic, digital, and circumstantial evidence presented by the prosecution revealed a meticulously orchestrated series of actions leading up to and following the murders. From searching for fatal blows to the head, to buying freezers and attempting to access the victims’ finances, every move seemed deliberate. Jurors took just over five hours to return a unanimous verdict of guilty.
Investigation, Aftermath, and the Path to Justice
Detective Chief Inspector Ollie Stride, who led the investigation, called the murders “one of the most harrowing” his team had ever dealt with. The case demanded piecing together CCTV footage, digital forensics, computer search logs, and witness statements—many of which involved disturbing and graphic content. He commended the officers, forensic experts, and witnesses who contributed to building the case and bringing the perpetrator to justice.
Yostin Andres Mosquera’s conviction marks the end of a deeply complex investigation. His sentencing has been postponed to October 24, as Judge Mr Justice Bennathan KC has ordered a psychiatric report before deciding the minimum term Mosquera will serve. The judge emphasized that while a life sentence is the only possible punishment, understanding Mosquera’s psychological state might influence the parole eligibility timeline.
The judge also recognized the emotional toll this case had on the jurors, thanking them for their dedication and resilience. He acknowledged how difficult it must have been to view such distressing evidence, especially the video of Mr. Alfonso’s murder, and encouraged any jurors in need of support to seek help through the court’s resources.
The Metropolitan Police also worked closely with the LGBT+ Independent Advisory Group, recognizing the victims’ identities and providing culturally sensitive support during the investigation. This collaboration helped ensure transparency and community trust in the handling of such a delicate case.
The public reaction to the verdict has been one of horror and relief. While the brutality of the crime shook many to their core, the conviction of Yostin Andres Mosquera provides a sense of justice. However, it also raises troubling questions about how a person capable of such premeditated violence could have lived undetected in a shared home.
Yostin Andres Mosquera’s calculated use of the internet to plan the murders—his interest in the fatal impact of head injuries, the purchase of a freezer, and the manipulation of financial data—highlights the need for early intervention and awareness of digital behaviors that may signal intent to harm. The criminal justice system will likely continue to explore how digital footprints can be used more proactively in future investigations.
As the victims’ families grieve the loss of two loved ones, and investigators reflect on the psychological toll of the case, Yostin Andres Mosquera remains in custody, awaiting final sentencing. His actions shocked the public, betrayed the trust of those who welcomed him into their home, and ultimately led to one of the most disturbing murder trials in recent British history.