A 26-year-old man was arrested on Monday, 8 March on suspicion of murder. He remains in custody at a south London police station.
On Sunday, 7 March, Kamila Ahmad, 22, of Robinhood Lane, Mitcham, was charged with murder.
She appeared in custody at Bromley Magistrates’ Court on Monday, 8 March. She is due to appear next at the Old Bailey on Wednesday, 10 March.
Police were called by the London Ambulance Service at 12:12hrs on Wednesday, 3 March to Alpha Road in Croydon.
Officers attended and found 19-year-old Tai with a number of knife wounds to his legs. He was pronounced dead at the scene at 12.17pm. His family was notified and is being supported by specialist officers.
Anyone with information that could assist detectives is urged to call the incident room on 020 8721 4005. Alternatively, they can call 101 or tweet @MetCC with the reference CAD 2875/03MAR.