As Douglas Cunningham was cycling home on July 10 last year he spotted a tourist hauling suitcases across Clifton Suspension Bridge who appeared a little lost.
But when he stopped to help, it soon became clear that Yostin Mosquera was no ordinary holidaymaker.
Dripping from the bulging suitcase in his hand was a bright red trail of blood.
Now after the 35-year-old was convicted of killing Paul Longworth and Albert Alfonso, the full horrific story can be told of how the Colombian was just moments away from getting away with murder as he prepared to hurl two suitcases containing his victims’ dismembered bodies over the bridge into the Avon Gorge 245ft below.
In a twisted tale of greed, brutality and sexual deviancy, just 48 hours earlier the Colombian porn actor had savagely battered and stabbed the British couple to death before decapitating and chopping up their bodies to steal their £400,000 London home and life savings.
Today as he faces a life sentence, it can be revealed that detectives believe the Jack the Ripper obsessed double murderer may have killed before.
Hailing from Medellin, police suspect that Mosquera may have been involved with the ruthless drug cartels which made the Colombian city the murder capital of the world.
But despite extensive inquiries in the UK, Colombia and elsewhere in the world, Scotland Yard have been unable to dig up anything from Mosquera’s past to explain the brutally cold efficiency with which he carried out the murders which were captured on camera.
Yostin Andres Mosquera, pictured here eating fish and chips in a British pub, brutally murdered two men in their London flat
The Colombian national, pictured here in an ID photo, befriended Paul Longworth and Albert Alfonso over the internet
He would later killed the couple in their London flat. Pictured: Mr Longworth (left) and Mr Alfonso (right) on holiday in Colombia
Yostin Mosquera dragging the suitcase containing body parts to Clifton Suspension Bridge
Detective Chief Inspector Ollie Stride said: ‘Our first thought was that this is not your first crime so we have done quite a lot of work looking at previous offending either here, or there or anywhere. We have not come across anything.
‘We have got no evidence that he was involved in drug gangs but that was something that we thought about and looked at.’
He revealed the level of violence used by Mosquera shocked detectives after he was caught on a web cam dancing and singing in jubilation within seconds of slitting the throat of Albert Alfonso.
‘Watching the video it was quite brutal, clinical, we wondered whether there was any military training,’ the officer added.
In a country where more than half of crimes go unreported due to fears about corruption, police inaction and reprisals, it is perhaps unsurprising that there is little documented about Mosquera’s murky background.
By day, Mosquera claimed that he worked in IT in an office in Medellin where he lived with his wife and child.
But he spent his nights doing ‘modelling’, earning extra cash as a ‘performer’ on a pornography website where he performed various sexual acts under the name ‘I am black master’ and ‘Mr d*** 20cm’.
Albert Alfonso first came across the tall muscular Colombian more than 10 years ago on a specialist website where he sold videos of himself performing sex acts involving defecation, urination and vomiting in return for payments between £20-£80.
The chest freezer where the victims decapitated heads were found by police
The storage space of the divan bed where Paul Longworth’s body was hidden by Yostin Mosquera
Police found bloody towels in the storage space of the divan bed which contained Paul Longworth’s DNA
The hammer used to kill Paul Longworth
The 62-year-old swimming instructor had what Prosecutor Deanna Heer, KC, described as a ‘predilection for extreme sex, which he videoed and posted online on specialist websites.’
When Mr Alfonso became a regular customer, Mosquera worked hard to befriend him and his 71-year-old handyman partner, who did not engage in the sordid sessions.
In October 2023, the couple invited Mosquera to Britain where the trio enjoyed sightseeing trips around London, posing for pictures at Madame Tussauds, trips on an open top bus and a river boat.
When Mr Alfonso paid for everything, Mosquera began to formulate a plan.
On his return to Colombia, he filmed a provocative video, entitled ‘For me, slave albert’ in which he appeared dressed as Father Christmas.
A short time later he invited the couple to holiday in Colombia in March 2024.
Photographs on social media show the two greying men with their arms around the laughing younger man on speed boat trips, swigging beers and sheltering from the intense heat under a parasol.
But behind the sunshine snaps, Mosquera was planning something darker.
Yostin Mosquera was wearing a blood splattered t-shirt when he was arrested
Yostin Mosquera outside the house of his victims days before he brutally murdered them
Yostin Mosquera bought a chest freezer on Facebook Marketplace and had it delivered to the murder scene
In June he was invited to stay again in the couple’s home in Shepherd’s Bush, this time with Mr Alfonso paying for a month-long English course, gym membership, and trips to Brighton where Mosquera was seen grinning drinking beer and going on a zip-wire.
Even before he had landed in Heathrow, Mosquera had started researching the value of the victims’ home.
In the days that followed, he downloaded Mr Alfonso’s bank details, passwords and started searching on Facebook Marketplace for a chest freezer and an ‘industrial blender’.
Other internet searches included ‘serial killers of London’, ‘Jack the Ripper film’ and he started looking for properties for sale in his home city.
On the morning July 8 after Mr Alfonso went to work, Mosquera pounced on his elderly partner shattering his skull with nine hammer blows to the head.
He bundled his body into a divan storage space under the couple’s bed before going online to arrange for his flight home.
When Mr Alfonso came home at 7.45pm, a masked Mosquera led him to the bedroom to make a sex tape.
Jurors were shown graphic images from the video showing Mosquera approaching Mr Alfonso with a knife as the victim knelt naked on the floor in a submissive position.
Yostin Mosquera is seen walking with the victims Alberton Alfonso and Paul Longworth prior to the murders
Yostin Mosquera with one of the victims near to their flat in Shepherd’s Bush
Mosquera, who was wearing a number of strap-on prosthetic penises, plunged a knife into Mr Alfonso’s neck, stabbing him 13 times asking, ‘Do you like it?’.
During a prolonged struggle the two naked bloodied men fought, knocking over the web cam before Mosquera forced the victim onto the bed and slit his throat.
The prosecutor said: ‘What is striking, when one considers the footage, is just how calm and in control the defendant remains throughout.
‘Indeed, so unconcerned does he appear by what he has just done that, as Mr Alfonso lies on the floor dying, the defendant starts singing and breaks into a dance before making his way directly to Mr Alfonso’s desktop computer, which he then begins to use, and to access Mr Alfonso’s finances.’
As Mr Alfonso lay dying a few feet away from his hidden dead partner, Mosquera attempted to get into the victim’s bank and Paypal account.
Ms Heer described the chilling look on Mosquera’s face: ‘It is not shock, it is not horror, it is not concern for anything that is happening.
‘It is elation, it is behaviour unperturbed by what has happened.’
‘His actions were cold and calculated. He knew he had two bodies to dispose of.
‘He continued to cover his tracks all the way to Bristol.’
Over the next two days, Mosquera chopped up their remains with a saw, placing their heads in a chest freezer and body parts in suitcases before ordering an unsuspecting man with a van to take him to Bristol.
After withdrawing hundreds of pounds from the victims’ accounts, Mosquera sent messages from Mr Alfonso’s phone to his boss claiming the victim was flying to Costa Rica for a family emergency.
He might have got away with it, but for the chance encounter with the passing cyclist on the 160-year-old bridge.
Mosquera tried to claim the red liquid oozing from the suitcase was oil from car parts, but when Mr Cunningham asked to see inside the case, he panicked and fled.
Police launched a manhunt arresting the killer three days later sitting on a bench outside Bristol Temple Meads Station still wearing a bloodstained t-shirt.
But astonishingly he tried to blame the murders on his victims, claiming he had stabbed Mr Alfonso in self-defence after watching him kill his partner.
Jurors were unconvinced, convicting him of the double murder today after just five hours of deliberations.
Mosquera showed no emotion as he was convicted at Woolwich Crown Court.
He will be sentenced on October 24.
