A man was stabbed to death in Mottingham south-east London in the early hours of Boxing Day. The 64-year-old was found with critical injuries in Luxfield Road at about 02:10 GMT.
He was pronounced dead at the scene. A 52-year-old man was arrested on suspicion of murder close to where the victim was found BBC News reports.
The suspect and the victim knew each other but were not related, the Metropolitan Police said. The victim's next of kin have been informed.
Anyone with information that may help the investigation should call the incident room on 020 8721 4961 or via 101, or contact Crimestoppers on 0800 555 111.