A 41-year-old man was arrested on suspicion of murder on the evening of Thursday, 26 December. He remains in custody at a south London police station.
Police were called at approximately 9.30pm on Monday, 23 December to reports of a stabbing in Woodcroft Road, Thornton Heath.
Officers and London Ambulance Service attended. A 60-year-old man was found outside a residential address suffering from stab wounds. The injured man was pronounced dead at the scene at 9.49pm.
Next of kin have been informed although formal identification awaits.
A post-mortem examination will be scheduled in due course.
A homicide investigation has been launched led by Detective Chief Inspector Simon Harding.
A 50-year-old man was arrested at the scene on suspicion of murder and taken into custody. While in custody he became unwell and was taken to hospital where he remains in a stable condition.
DCI Harding said: “The victim was found injured in a residential street. While it is not a heavy footfall location, there may have been members of the public travelling through Woodcroft Road who saw something. I urge those people to come forward and speak to my officers without delay.
“No matter how insignificant you think it may be please do make the call. We are building the sequence of events leading up to and immediately following this attack which has led to a man’s death, your call could complete the picture.”
Enquiries into the circumstances continue; police believe the victim and suspect were known to each other.