The BBC reports that a second man has been arrested by police investigating the murder of David Gavin, 26, who was discovered at his flat in Athelstan Road, on Wednesday night.
The 23-year-old man is being questioned at a police station in Kent, a police spokeswoman said.
Officers are continuing to hold a 28-year-old man arrested on Thursday after being given an extra 30 hours.
Detectives are appealing for witnesses to the incident to contact Kent Police or Crimestoppers.
More than 50 officers are working on the investigation. A post-mortem examination revealed that David Gavin died from stab wounds.
The victim was seen having an argument in Athelstan Road earlier on Wednesday, which involved more than one person.