Earl Morin-Briton, of Rosehill, Sutton, was found guilty on June 6 of murder and possession of a knife following a trial at Kingston Crown Court.
At his sentencing on June 9, he was jailed for life to serve a minimum of 27 years.
Earl Morin-Briton (Image: Metropolitan Police)The court heard that on August 24, 2023 Mr. Porteous was sitting in his car in the car park of a block of flats on Thessaly Road in Nine Elms.
Morin-Briton approached the vehicle and spoke to him through the open driver’s window.
Mr. Porteous exited the car and was immediately confronted by Morin-Briton, who pulled a large knife from his shorts and stabbed him three times—in the face, neck, and back.
Witnesses to the attack rushed to Mr. Porteous’s aid, and emergency services, including paramedics and officers from the Metropolitan Police, arrived promptly.
Mr. Porteous died at the scene.
Detective Chief Inspector Wayne Jolley, from Specialist Crime South, led the investigation.
He said: “Morin-Briton murdered Theo in an unprovoked and senseless attack in broad daylight.
“Theo was simply sitting in his car when Morin-Briton approached him, saying something which caused Theo to get out of the vehicle.
“What he was tragically unaware of was that the defendant had in his possession a large knife which he then used to stab Theo numerous times.”
Morin-Briton was arrested on September 1, 2023 at an address in Norwood and charged the following day.
The victim, Theo Porteous, was remembered by his former teammates at Old Thorntonians FC, who paid tribute to him after his death.
The club said: “Today we remember former player Theo Porteous, who sadly, was fatally stabbed last week in Battersea.
“To pay tribute to Theo, today all teams, both home and away, will wear black armbands and observe a minute’s applause before their matches.”
Chief Inspector Jolley added: “Nothing will ever bring Theo back to them but I do hope this outcome will give them some sense of closure.
“Our investigation combined solid detective work with crucial CCTV evidence—enabling us to get justice for Theo’s family and take a very dangerous individual off the streets.”
