Yostin Andres Mosquera has been convicted of the brutal murders of civil partners Albert Alfonso and Paul Longworth, following a trial that laid bare a sequence of violent, premeditated actions and attempts to conceal the crimes. The jury at Woolwich Crown Court reached unanimous guilty verdicts after five hours of deliberation, concluding a trial that prosecutors described as revolving around “ruthless and carefully orchestrated” violence.

Yostin Andres Mosquera

Woolwich Crown Court

The events unfolded in July 2024, when Mosquera, 35, killed 71-year-old Paul Longworth by bludgeoning him with a hammer in the couple’s southeast London home. The court heard that Mosquera then hid Longworth’s body in a divan bed, while leaving his dog confined in an upstairs bedroom. He remained in the home overnight, using that time to research topics such as “fatal head injuries” and “how long it takes for a body to decompose.”

The following day, July 9, Mosquera killed 62-year-old Albert Alfonso, with whom he had a brief sexual relationship. CCTV and other monitoring equipment installed in Alfonso’s bedroom captured the attack, which occurred during sex. Prosecutors said Mosquera stabbed Alfonso 22 times, evidence that countered his later claim of a moment of uncontrolled rage.

CCTV

Detective Chief Inspector Kate Blackburn described the actions as “cold, calculated, and horrific,” explaining that Mosquera had taken steps to hide a knife in a pillowcase beforehand. “The footage was deeply distressing, but crucial,” she noted.

In the aftermath of the murders, Mosquera took steps to disguise his actions and plan his departure. He purchased a chest freezer to store the dismembered remains of both victims, attempted to transfer £4,000 from Alfonso’s bank account to his own, and reportedly withdrew cash from numerous ATMs. He also purchased a flight ticket to Colombia, his country of origin.

Colombia

On July 10, Mosquera hired a driver through a ride-hailing service to take several suitcases to Clifton Suspension Bridge in Bristol. According to authorities, he told the driver he was delivering a friend’s belongings. Passersby became suspicious after noticing blood leaking from the luggage. Police were alerted, and when they opened the suitcases, they discovered body parts belonging to both victims.

Upon arrest, Mosquera initially denied involvement. However, digital evidence, including phone activity, CCTV, and recovered messages between him and Alfonso, became central to the Crown Prosecution Service‘s case. “This was not a spontaneous crime,” said Chief Crown Prosecutor Jaswant Narwal. “The level of planning and the steps taken to avoid detection were stark and chilling.”

CCTV

Crown Prosecution Service

Jaswant Narwal

Mosquera was handed a life sentence and will serve a minimum term to be determined pending the results of a psychiatric evaluation. Sentencing has been scheduled for October 24, 2025.

Relatives of Alfonso and Longworth were present in court and, through victim impact statements, spoke of their profound loss. A family spokesperson for Alfonso said he was “a kind, generous man who deserved none of this.”

At the conclusion of the trial, police praised the courage of witnesses and the meticulous work by forensic experts. Authorities said the case demonstrated the growing role of domestic surveillance and digital trails in modern investigations.

Detective Chief Inspector Blackburn added: “These were two innocent men, targeted for financial gain. Mosquera’s actions show a total lack of remorse and humanity.”