Last Thursday, police were called to outside a block of flats on London Road, where two men were found with stab wounds.
One man, aged 33, was taken to hospital with non-life threatening injuries.
However, 25-year-old Patrick De’Almeida was pronounced dead at the scene.
Yesterday, a 33-year-old was arrested at Heathrow Airport, and a 28-year-old in Croydon.