What began as an innocent day trip to the seaside ended in something almost beyond belief.
A man who appeared to be enjoying a day on the Brighton beach zip wire would later be accused of committing one of the most disturbing double killings seen in recent years.
In July 2024, Yostin Andres Mosquera, a 35-year-old Colombian national and adult film actor, had been staying in the London flat of two older men—Albert Alfonso, 62, and Paul Longworth, 71.
By July 10, both men were dead, their remains dismembered and stuffed into suitcases left in public view.
How an Online Connection Turned Deadly
Mosquera is said to have met Mr. Alfonso online through fetish-focused platforms, using aliases like “iamblackmaster” and “mrd-k20cm.”
Their relationship, according to prosecutors, centered around extreme sexual practices, which Mr. Alfonso filmed and sometimes posted online.
While their interactions may have appeared consensual on the surface, the deeper details paint a disturbing picture of coercion, domination, and eventual violence.
Brighton Trip Captured on Video Before Murders
On June 29, Mosquera and Mr. Alfonso took a day trip to Brighton, captured on CCTV and even filmed riding a zip wire on the beach.
The clip showed Mosquera grinning, wearing a yellow helmet and blue shorts, set to cheerful background music.
But behind that carefree scene, events were building toward a horrifying act.
CCTV Footage Tracks the Days Before the Killings
The next day, both men were seen returning to their Shepherd’s Bush flat—often accompanied by Mr. Longworth.
Police later tracked Mosquera’s movements through detailed CCTV footage.
By July 8, the day of the killings, Mr. Alfonso was seen cycling to his gym job early in the morning, while Mr. Longworth appeared on camera chatting with a neighbor from a window—the last time he would be seen alive.
Violence Behind Closed Doors
According to prosecutors, Mosquera allegedly killed Mr. Longworth sometime between late morning and early afternoon by repeatedly striking him with a hammer.
Hours later, after Mr. Alfonso returned home, the second killing took place—this time in front of a camera during what was supposed to be a sexual encounter.
Jurors were shown deeply disturbing footage of Mr. Alfonso being stabbed to death, with Mosquera reportedly singing and dancing moments after slitting his throat.
Dismemberment and a Chilling Disposal
Two days after the murders, a cyclist crossing the Clifton Suspension Bridge in Bristol encountered Mosquera standing near two large suitcases.
One was red, the other a silver trunk.
Mosquera claimed the suitcases contained “car parts.” In reality, they held the mutilated remains of Mr. Alfonso and Mr. Longworth.
Their severed heads were later discovered by police in a chest freezer back at the couple’s flat in West London.
A Look Into the Victims’ Lives
Both victims were described by friends and neighbors as a loving, quiet couple.
Mr. Alfonso, originally from France, worked as a swimming instructor. Mr. Longworth, who was Irish, had been a handyman.
Neighbors said they had never witnessed conflict between them.
However, deeper testimony revealed that Mr. Alfonso had a long history of engaging in extreme sexual acts, sometimes paying partners to dominate and humiliate him, including urination, defecation, and vomiting—all recorded and published online.
A Troubled Relationship Revealed in Court
A man using the pseudonym James Smith testified about his past with Mr. Alfonso, saying their relationship began in deeply troubling circumstances when he was younger and vulnerable.
Though their dynamic evolved into something more familiar over time, Mr. Smith admitted he had been manipulated into sexual activity on camera and had remained in contact largely due to pressure and fear of exposure.
Despite all this, Smith said he came to view both Alfonso and Longworth as family, and they would share non-sexual moments together in private.
Mosquera Faces Charges Amid Harrowing Evidence
Mosquera is now on trial at Woolwich Crown Court, where he denies murdering both Mr. Alfonso and Mr. Longworth—but admits manslaughter in Mr. Alfonso’s case.
Prosecutors argue the brutal double killing was a calculated act, potentially driven by theft and personal gain.
The court heard that Mosquera had access to the flat via a key and could come and go as he pleased.
On the day of the killings, he allegedly stayed in the flat after both murders and later attempted to dispose of the bodies by transporting them to Bristol.
The Trial Continues as Shocking Details Emerge
As jurors continue to view footage and hear testimony, the case paints a horrifying picture of exploitation, betrayal, and premeditated violence.
The story of two men who opened their home to someone they trusted—and were ultimately killed by him—has sent shockwaves through both the LGBTQ+ and broader communities.
The trial is ongoing.