A teenage international kart racer stabbed his Airbnb host to death within hours of renting the room from her when he was just 16, according to UK prosecutors. Enzo Bettiamo, now 18, allegedly used a large silver knife to murder 27-year-old Kamonnan Thiamphanit at her home in London before fleeing to Dubai,  the Times of London reported . Thiamphanit, also known as Angela, was found in April 2024 with “multiple stab wounds all over her body [and] a large silver knife … protruding from the side of her neck,” the jury in London was told Tuesday. Kamonnan Thiamphanit, 27, was found stabbed to death in her Airbnb property. Met Police Bettiamo, an international kart racer and dual citizen of Brazil and Italy, was 16 when he used Airbnb to book a room in Thiamphanit’s home near Marble Arch in central London for a month. The teenager checked in after arriving in the UK from Los Angeles on April 5, 2024.…